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Health Conditions

Find information on various health conditions affecting people of all ages. This category covers causes, symptoms, diagnosis, and management options for physical illnesses and chronic diseases. Get insights to help you understand different health challenges and make informed decisions about your wellbeing.

Microscopic view of bacteria that can cause endocarditis.

Causes of Endocarditis

Endocarditis, Health Conditions /

Causes of Endocarditis The causes of endocarditis centre on how infectious organisms—usually bacteria—enter the bloodstream and infect the heart. Endocarditis typically occurs when these bacteria attach to areas of the heart lining or valves that are already damaged or abnormal. Common Entry Points for Bacteria Dental procedures or poor oral hygiene, which allow mouth bacteria to enter the blood Infected skin wounds or pressure sores Use of intravenous drugs, which introduces unsterile substances directly into veins Catheters, intravenous lines, or implanted medical devices Urinary tract infections or surgical procedures involving the bladder or intestines Unsterile medical equipment in settings with poor infection control Once in the bloodstream, bacteria such as Staphylococcus aureus, Streptococcus viridans, or Enterococcus species may reach the heart. They can settle on heart valves, especially if the valves are already scarred or prosthetic. These bacteria then form vegetations—clumps of germs and damaged tissue—that interfere with normal valve function and may break off and travel to other organs. Risk Factors People at highest risk for endocarditis include: Those with artificial heart valves People with congenital heart defects Individuals with a previous history of endocarditis People with rheumatic heart disease, which remains a concern in South Africa Patients undergoing hemodialysis People who inject drugs Individuals with HIV, especially if immunity is compromised Causes of Endocarditis Fungal endocarditis, although less common, can occur in immunocompromised individuals or after long-term antibiotic use. It is more difficult to treat and often requires surgery. In South Africa, the burden of untreated dental infections, poor access to safe medical equipment, and high rates of HIV and rheumatic fever contribute to a greater risk of endocarditis in rural and underserved populations. Understanding the causes of endocarditis helps identify who needs preventive care and allows for early intervention when symptoms arise. Prevention strategies include good oral hygiene, sterile medical procedures, and targeted antibiotic use before certain surgeries. [Next: Symptoms of Endocarditis →]

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Woman clutching chest in discomfort, indicating possible symptoms of endocarditis.

Symptoms of Endocarditis

Endocarditis, Health Conditions /

Symptoms of Endocarditis The symptoms of endocarditis can vary widely and often resemble other illnesses, making the condition difficult to diagnose in its early stages. Because endocarditis affects the heart’s inner lining and valves, symptoms arise from infection, inflammation, and impaired blood flow. Prompt recognition is essential to avoid serious complications. General Symptoms These are often the first signs: Fever and chills, especially recurring or persistent Fatigue and weakness Muscle and joint pain Night sweats Loss of appetite and weight loss These non-specific symptoms may develop slowly in subacute endocarditis or rapidly in acute cases. Patients may dismiss them as flu or a common infection. Heart-Related Symptoms As the infection progresses, patients may notice: Shortness of breath Swelling in the legs, feet, or abdomen (due to heart failure) Chest pain, particularly if the infection affects blood flow Heart murmurs, which may be new or changing Doctors often detect a murmur using a stethoscope, especially in people with valve infections. Specific Signs of Endocarditis More advanced or classic signs include: Petechiae – small red or purple spots on the skin or inside the mouth Osler’s nodes – painful red bumps on fingers or toes Janeway lesions – painless spots on palms or soles Roth spots – small retinal haemorrhages seen in eye exams Splinter haemorrhages – thin, red lines under the nails These signs appear due to small clots or pieces of infected material travelling from the heart to other parts of the body. Symptoms of Endocarditis Complications and Red Flags In advanced cases, symptoms may include: Stroke symptoms (sudden weakness, confusion, speech difficulty) Kidney pain or blood in the urine Persistent coughing or fluid in the lungs In South Africa, people living with HIV or in rural areas may present later in the disease course, increasing the risk of complications. Recognising the symptoms of endocarditis early can be life-saving. Anyone with heart problems, a history of valve disease, or unexplained fever and fatigue should see a doctor without delay. [Next: Diagnosis of Endocarditis→]

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Doctor performing heart ultrasound to diagnose endocarditis in a male patient.

Diagnosis of Endocarditis

Endocarditis, Health Conditions /

Diagnosis of Endocarditis The diagnosis of endocarditis involves combining a careful review of symptoms, physical examination, blood tests, and imaging studies. Because endocarditis may present with vague symptoms, early diagnosis can be difficult. However, identifying it quickly is critical for preventing complications and saving lives. Diagnosis of Endocarditis Doctors start by taking a full medical history and asking about: Pre-existing heart conditions Recent dental procedures or infections Use of intravenous drugs History of valve surgery or implanted medical devices A physical exam may reveal: A new or changed heart murmur Skin changes like petechiae, splinter haemorrhages, or Osler’s nodes Signs of heart failure or embolic complications (e.g. stroke symptoms) Blood Tests Blood cultures are the cornerstone of diagnosis. At least three separate blood samples are collected to check for bacteria or fungi in the bloodstream. Identifying the organism helps determine the best treatment. Other blood tests may include: Full blood count (often shows anaemia or raised white cells) C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR), which indicate inflammation Kidney function tests and urinalysis Echocardiography This imaging test checks the heart’s structure and function: Transthoracic echocardiogram (TTE) – a non-invasive test done through the chest wall Transoesophageal echocardiogram (TOE/TEE) – more sensitive, using a probe inserted into the oesophagus to give a clearer view of the heart valves An echocardiogram may reveal vegetations (clumps of bacteria and tissue), valve damage. Additionally, abscesses—clear signs of endocarditis. Other Investigations ECG (electrocardiogram) to check for rhythm problems Chest X-ray to look for fluid in the lungs or heart enlargement MRI or CT scan if embolic complications (like stroke or kidney infarction) are suspected In South Africa, delays in access to echocardiography and blood cultures can delay diagnosis. Furthermore, where advanced imaging is unavailable, clinical judgement and blood tests become even more crucial. Doctors use the modified Duke criteria, a standard diagnostic tool that combines clinical signs, blood culture results, and echocardiogram findings to confirm or rule out endocarditis. The diagnosis of endocarditis requires careful testing and urgent attention. Furthermore, early identification improves outcomes and allows treatment before complications become severe or irreversible. [Next: Treatment of Endocarditis →]

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Heart-shaped layout of various antibiotics and pills symbolising treatment for endocarditis.

Treatment of Endocarditis

Endocarditis, Health Conditions /

Treatment of Endocarditis The treatment of endocarditis aims to eliminate the infection, repair any heart damage, and prevent serious complications. Because endocarditis is potentially life-threatening, patients are typically admitted to hospital for immediate care and monitoring. Antibiotic Therapy The primary treatment is high-dose intravenous (IV) antibiotics, given over several weeks. The choice of antibiotic depends on the organism found in blood cultures. Common regimens include: Penicillin or ceftriaxone, often combined with gentamicin for synergy Vancomycin for MRSA or penicillin-resistant organisms Ampicillin, linezolid, or antifungals in special cases Treatment duration usually ranges from 4 to 6 weeks, depending on the type of organism, the patient’s condition, and whether heart valves are native or artificial. Patients start IV antibiotics in hospital but may continue treatment at home through outpatient IV therapy (if stable and resources allow). In many South African settings, prolonged hospital stays are more common due to resource constraints and monitoring needs. Surgery Surgery is sometimes required when: There is severe valve damage causing heart failure Large vegetations are present and at risk of embolism Abscesses or persistent infection occur despite antibiotics The infection involves a prosthetic valve Surgical options include valve repair or replacement. In some cases, especially with fungal endocarditis or drug-resistant bacteria, surgery is urgent. Supportive Care Patients may need: Oxygen for shortness of breath Diuretics to relieve fluid overload in heart failure Pain relief and rest Nutritional support during recovery | Treatment of Endocarditis Monitoring for complications such as stroke, kidney problems, or embolic events is essential throughout treatment. In South Africa, public hospitals may face challenges in accessing specialist cardiac surgeons or long-term IV therapy infrastructure. Efforts are underway to decentralise care and improve follow-up in rural areas. The treatment of endocarditis is intensive but often successful if started early. Completing the full course of antibiotics and following up with cardiac care are key to long-term health. [Next: Complications of Endocarditis →]

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Illustration of heart valve damage showing complications from endocarditis.

Complications of Endocarditis

Endocarditis, Health Conditions /

Complications of Endocarditis The complications of endocarditis can be severe and life-threatening. If endocarditis is not diagnosed and treated early, it can cause widespread damage to the heart and other organs. Even with treatment, some patients develop long-term problems. Cardiac Complications Heart valve damage – Infection can destroy valves, leading to severe leakage (regurgitation) and heart failure. Heart failure – Damaged valves reduce the heart’s ability to pump blood, causing fluid build-up in the lungs and body. Abscess formation – Infection may spread into the heart muscle or surrounding tissues. Conduction abnormalities – If the infection affects the electrical system of the heart, it may cause arrhythmias or heart block. Embolic Complications Vegetations on heart valves can break off and travel through the bloodstream, causing: Stroke Kidney infarction Pulmonary embolism Limb ischaemia Spleen or liver damage These events can occur suddenly and may be the first sign of undiagnosed endocarditis. Infection Spread Untreated or resistant infection may spread to: Bones (causing osteomyelitis) Joints (septic arthritis) Lungs (infected emboli or abscesses) Brain (meningitis or abscesses) This systemic spread is especially dangerous and harder to treat. Immune System Complications Chronic endocarditis can trigger immune responses leading to: Glomerulonephritis, a kidney condition causing blood or protein in the urine Vasculitis, inflammation of blood vessels causing skin rashes or joint pain In South Africa In South Africa, late diagnosis, untreated rheumatic fever, and limited access to advanced care contribute to more frequent and severe complications. Patients with HIV, TB, or those living in rural areas are particularly at risk. Mortality Risk | Complications of Endocarditis Despite treatment, endocarditis has a significant risk of death—especially in cases involving prosthetic valves, fungal infection, or complications such as stroke or heart failure. Early recognition and complete treatment are essential to reduce mortality. Understanding the complications of endocarditis reinforces the importance of early care, prevention through dental hygiene, and careful monitoring in high-risk patients. With proper treatment, many patients recover fully, but some may require lifelong heart care and follow-up. [Next: Back to Overview →]

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Illustration of encephalitis showing a tick bite and virus infecting the brain.

Encephalitis

Encephalitis, Health Conditions /

Encephalitis Encephalitis is a serious condition where the brain becomes inflamed, usually due to a viral infection. This swelling interferes with normal brain function and can lead to symptoms ranging from fever and headache to confusion, seizures, and loss of consciousness. This can affect anyone but is most dangerous in young children, the elderly, and people with weakened immune systems. In many cases, encephalitis begins with flu-like symptoms, but it can quickly worsen. Early detection and treatment are critical, as severe cases can cause permanent brain damage or even death. The condition is considered a medical emergency and should always be evaluated in hospital settings. There are two main types: Primary encephalitis, where the virus or other cause directly infects the brain Secondary encephalitis, which occurs when the body’s immune system mistakenly attacks brain tissue while fighting an infection elsewhere in the body Encephalitis The most common viral causes include herpes simplex virus (HSV), enteroviruses, arboviruses (like West Nile virus), and, in some regions, rabies or measles. In South Africa, HIV-related complications, TB, and mosquito-borne viruses can also lead to this condition. Symptoms range from mild to life-threatening and may come on suddenly or worsen over several days. Common signs include fever, headache, stiff neck, seizures, confusion, and changes in personality or speech. Infants may become irritable, feed poorly, or have a bulging soft spot (fontanelle) on their heads. Understanding encephalitis allows for quicker response when symptoms appear. With timely medical care, many patients recover—though rehabilitation may be needed in more severe cases. [Next: Causes of Encephalitis →]

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3D illustration of virus particles that cause encephalitis.

Causes of Encephalitis

Encephalitis, Health Conditions /

Causes of Encephalitis The causes of encephalitis are most often viral, but bacterial, fungal, autoimmune, or parasitic infections can also be responsible. In all cases, encephalitis results from inflammation of the brain, which disrupts normal nerve function and leads to potentially life-threatening symptoms. Viral Causes Viruses are the leading cause. Common culprits include: Herpes simplex virus (HSV-1) – one of the most dangerous and common causes of severe encephalitis in adults Enteroviruses, including coxsackievirus and echovirus Arboviruses, such as West Nile virus, Japanese encephalitis virus, and tick-borne encephalitis virus Measles, mumps, and rubella – particularly in unvaccinated individuals Rabies virus, although rare, is almost always fatal if not treated before symptoms appear HIV-related encephalitis, due to weakened immunity or co-infections In South Africa, mosquito-borne viruses, HIV complications, and opportunistic infections like cytomegalovirus (CMV) in people with AIDS can also trigger encephalitis. Bacterial and Other Infections Bacteria like Mycoplasma pneumoniae or Borrelia burgdorferi (Lyme disease) may rarely cause encephalitis. In infants, group B streptococcus and Listeria infections can be responsible. Tuberculosis is another known cause in South Africa, especially in rural or high-burden areas. Fungal encephalitis is uncommon but can occur in people with compromised immunity. Fungi such as Cryptococcus or Aspergillus may spread to the brain in such cases. Autoimmune Encephalitis | Causes of Encephalitis In autoimmune encephalitis, the immune system mistakenly attacks the brain. This type may be triggered by cancer, infections, or may occur without a clear cause. Anti-NMDA receptor encephalitis is one recognised form, especially in young women. Post-Infectious or Parainfectious Encephalitis This occurs when the body’s immune response to an infection—such as measles or influenza—causes inflammation in the brain after the initial infection has cleared. It is more common in children and is sometimes referred to as acute disseminated encephalomyelitis (ADEM). Understanding the causes of encephalitis helps doctors choose the right tests and treatments quickly. Early identification is vital, especially in regions like South Africa where TB and HIV may complicate the clinical picture. [Next: Symptoms of Encephalitis →]

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Man holding his head in pain with red highlight indicating headache from encephalitis.

Symptoms of Encephalitis

Encephalitis, Health Conditions /

Symptoms of Encephalitis The symptoms of encephalitis vary widely depending on the cause, severity, and area of the brain affected. In mild cases, encephalitis may resemble a cold or flu, while in more severe cases, symptoms can progress quickly and become life-threatening. Recognising these warning signs early is essential for seeking urgent medical care. Early Symptoms Initial signs often resemble a viral illness and may include: Fever Headache Fatigue or weakness Nausea and vomiting Stiff neck Sensitivity to light (photophobia) These may go unnoticed or be mistaken for a common infection. However, symptoms often progress over hours or days. Neurological Symptoms As the infection worsens, brain function becomes affected, leading to: Confusion or disorientation Difficulty speaking or understanding speech Behavioural changes or irritability Memory loss or inability to concentrate Seizures Hallucinations Drowsiness or loss of consciousness Children may show symptoms differently. They may become extremely irritable, cry persistently, refuse food or milk, or have seizures. In infants, a bulging fontanelle (soft spot) may signal increased pressure in the brain. Severe and Emergency Symptoms Difficulty waking Coma Sudden paralysis or weakness on one side of the body Severe seizures that don’t stop Breathing difficulty | Symptoms of Encephalitis In South Africa, where HIV and TB are prevalent, these symptoms may overlap with other infections, making diagnosis harder. However, the rapid onset of altered mental state or seizures should always prompt emergency medical care. Symptoms of encephalitis are serious and may progress quickly. Early hospital admission, brain imaging, and lab testing are key to identifying the cause and starting treatment. [Next: Diagnosis of Encephalitis→]

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Doctor examining brain scans for signs of encephalitis.

Diagnosis of Encephalitis

Encephalitis, Health Conditions /

Diagnosis of Encephalitis The diagnosis of encephalitis can be challenging because the symptoms often resemble other conditions such as meningitis, stroke, or severe flu. However, accurate and early diagnosis is critical, as encephalitis can progress quickly and cause permanent brain damage or death if not treated promptly. Doctors begin by reviewing the patient’s symptoms, medical history, and possible exposures. They will ask about recent infections, vaccination status, travel history, insect bites, and whether the person has a weakened immune system. In South Africa, TB, HIV, and vector-borne illnesses are also considered when diagnosing encephalitis. Physical and Neurological Examination A detailed examination checks for signs of brain inflammation. This may include: Level of consciousness Reflexes and coordination Muscle strength and tone Eye movements and speech Any change in mental state, seizures, or confusion suggests possible brain involvement. Tests to Confirm Diagnosis Lumbar puncture (spinal tap) – This is one of the most important tests. A small sample of cerebrospinal fluid (CSF) is taken from the spine and analysed for: White blood cell count (indicating infection or inflammation) Glucose and protein levels Presence of viruses or bacteria using PCR or cultures Tuberculosis testing in TB-prone regions Blood tests – Used to detect infections, autoimmune markers, or inflammation. In HIV-positive individuals, opportunistic infections like CMV or toxoplasmosis may be checked. Brain imaging (CT or MRI) – These scans help identify inflammation, swelling, bleeding, or masses in the brain. MRI is especially helpful in viral encephalitis cases. Electroencephalogram (EEG) – Records electrical activity in the brain. It may show patterns suggestive of encephalitis, particularly in those with seizures or altered consciousness. Viral and bacterial PCR testing – Detects genetic material of pathogens such as herpes simplex virus (HSV), enteroviruses, or TB. This allows for targeted treatment. HIV testing – In South Africa, many patients with encephalitis also undergo routine HIV screening to identify immunosuppression and guide care. Diagnosis of Encephalitis Diagnosis can take time, particularly when the cause is unknown or the patient is severely ill. However, treatment is often started before test results return if clinical suspicion is high. The diagnosis of encephalitis relies on a combination of tests, imaging, and clinical judgement. Early recognition and hospital-based investigation are essential for protecting brain function and improving outcomes. [Next: Treatment of Encephalitis →]

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Woman holding head in distress due to encephalitis complications.

Complications of Encephalitis

Encephalitis, Health Conditions /

Complications of Encephalitis The complications of encephalitis can be serious and long-lasting, particularly if treatment is delayed or if the infection is severe. Since encephalitis causes inflammation in the brain, complications often affect memory, movement, speech, and personality. Some people recover fully, but others may experience lifelong challenges. Neurological Complications Seizures – Brain inflammation can trigger seizures during the illness and increase the risk of epilepsy later. Cognitive problems – Memory loss, confusion, attention deficits, and poor problem-solving skills may remain after recovery. Speech and language difficulties – Some people struggle to speak, understand, or write clearly. Movement disorders – Tremors, weakness, or difficulty with balance and coordination can persist. Vision or hearing loss – Inflammation near sensory nerves may lead to partial or complete loss of sight or hearing. Behavioural and Emotional Changes Brain inflammation may lead to: Depression Anxiety or irritability Changes in personality Difficulty with social interaction These symptoms can affect relationships, employment, and independence. Physical Disabilities In severe cases, encephalitis may result in: Paralysis of one side of the body (hemiparesis) Chronic fatigue Dependence on carers for daily tasks Rehabilitation can help manage these symptoms, but some individuals may need long-term care. Death Though not common in mild cases, encephalitis can be fatal—especially in very young children, elderly people, or those with weak immune systems. Mortality rates are higher in untreated herpes simplex encephalitis, TB-related encephalitis, and cases involving rabies. In South Africa Complications of Encephalitis In South Africa, late diagnosis and limited access to advanced imaging or ICU support can increase the risk of complications. Infections such as HIV, TB, and malaria also contribute to more complex cases of encephalitis. Awareness among community health workers and faster referral systems can reduce the burden of complications. Access to rehabilitation and counselling services must also be improved—especially for those recovering in rural areas. Understanding the complications of encephalitis encourages early action and highlights the importance of continued care beyond hospital discharge. With support and therapy, many people regain independence and live fulfilling lives, even after severe illness. [Next: Back to Overview →]

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