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Microscopic view of influenza viruses affecting human lungs

Causes of Flu

Flu, Health Conditions /

Causes of Flu The causes of flu are rooted in infection by influenza viruses, which spread through droplets released when an infected person coughs, sneezes, or talks. Flu is highly contagious and can also spread via contact with contaminated surfaces, especially in crowded places like schools, offices, and public transport. Influenza Virus Types There are four main types of influenza viruses: Mutation and Antigenic Drift Influenza viruses constantly mutate, changing their surface proteins (haemagglutinin and neuraminidase). This process, called antigenic drift, allows the virus to evade the immune system, which is why previous exposure or vaccination may not provide full protection against future strains. How It Spreads Flu is mainly transmitted through: Droplet spread, from coughing or sneezing Surface contamination, where the virus lives for hours on doorknobs, mobile phones, and other shared items Direct contact, such as shaking hands with an infected person A person is most contagious in the first 3 to 5 days after symptoms begin but can spread the virus even before symptoms appear. Seasonal Patterns Flu outbreaks occur: During winter months in most countries With peaks between June and August in South Africa and between December and February in the northern hemisphere In tropical regions, flu can circulate year-round with multiple peaks Causes of Flu The causes of flu are deeply connected to how easily the virus spreads and evolves. Understanding its transmission helps people take steps to protect themselves and those around them. [Next: Symptoms of Flu →]

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Man sneezing into tissue showing flu symptoms

Symptoms of Flu

Flu, Health Conditions /

Symptoms of Flu The symptoms of flu often develop suddenly and are more intense than those of a common cold. Flu typically begins with a high fever and quickly progresses to include a range of respiratory and systemic symptoms. While many people recover within a few days to two weeks, others may develop complications that require medical attention. Common Symptoms Fever or chills Dry cough that may worsen over time Sore throat and difficulty swallowing Muscle aches and joint pain Headache, often severe Extreme tiredness or fatigue Nasal congestion or runny nose Loss of appetite Some people also experience: Sweating and clammy skin Watery eyes Nausea or vomiting (especially in children) Not everyone with flu has a fever. Elderly individuals, in particular, may present without fever but still have other severe symptoms. Differences Between Flu and Cold While colds develop gradually, the flu tends to start abruptly. Fatigue, body aches, and high fever are much more common and severe with flu. Colds rarely cause the exhaustion and muscle pain that flu typically brings. Symptom Cold Flu Onset Gradual Sudden Fever Rare Common Fatigue Mild Severe Body aches Uncommon Common and intense Cough Mild or moderate Persistent and dry Symptoms in Children Children with flu may show: Irritability or crying more than usual Refusal to eat or drink High fever, sometimes over 39°C Seizures, in rare cases (febrile seizures) Vomiting and diarrhoea are more common in children than in adults. When to Seek Medical Help Urgent care is needed if: Breathing becomes difficult or rapid Chest pain or pressure develops Symptoms improve then suddenly worsen Severe dehydration occurs Confusion or dizziness is present Symptoms of Flu Recognising the symptoms of flu allows for early treatment, especially in high-risk individuals. Antiviral medications are most effective when started within the first 48 hours of symptoms. [Next: Diagnosis of Flu→]

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Sick girl with thermometer and tissues indicating flu diagnosis

Diagnosis of Flu

Flu, Health Conditions /

Diagnosis of Flu The diagnosis of flu is often made clinically, based on symptoms and history, particularly during known outbreaks or flu season. Flu typically presents with sudden onset fever, chills, fatigue, cough, and muscle aches. Because symptoms overlap with other viral infections, doctors sometimes use tests to confirm the presence of influenza virus—especially in high-risk patients or those with complications. Clinical Assessment Healthcare providers assess: Symptom onset and severity Exposure to flu, such as recent contact with someone who is ill Time of year, especially during known influenza outbreaks in the community The combination of high fever, body aches, dry cough, and fatigue often points strongly to flu, even without testing. Rapid Diagnostic Tests Rapid influenza diagnostic tests (RIDTs) can detect flu virus proteins in 10–15 minutes They are quick but may miss some cases (lower sensitivity), especially early in infection Useful in settings like emergency rooms or care homes to guide treatment decisions Molecular Tests (PCR) Reverse transcription polymerase chain reaction (RT-PCR) is more accurate than RIDTs Detects small amounts of viral RNA and can identify the specific strain Often used in hospitals or reference labs Turnaround time is usually a few hours to a day Testing Is Most Helpful When: The patient is in a high-risk group (elderly, pregnant, chronically ill) Hospital admission is required The illness may affect public health responses (e.g., in an outbreak) Another diagnosis needs to be ruled out (e.g., COVID-19 or bacterial pneumonia) Differential Diagnosis Doctors must rule out: Common cold, which has milder symptoms COVID-19, which overlaps heavily with flu and often requires concurrent testing RSV, especially in children and the elderly Pneumonia, particularly if chest pain, productive cough, or shortness of breath is present In most mild cases, lab confirmation is not necessary unless symptoms persist or worsen. Diagnosis of Flu The diagnosis of flu combines clinical judgement with selective testing, depending on severity, context, and risk. Early identification supports timely treatment and helps prevent spread to others. [Next: Treatment of Flu →]

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Person in robe holding tea cup as flu treatment

Treatment of Flu

Flu, Health Conditions /

Treatment of Flu The treatment of flu focuses on symptom relief, rest, and preventing complications. Flu is typically self-limiting in healthy people, but those at risk of severe illness may require antiviral medications and closer monitoring. Early treatment can speed recovery and reduce the chance of hospitalisation. Self-Care and Supportive Treatment Most people recover at home with: Plenty of rest Hydration, with water, herbal teas, or clear broths Paracetamol or ibuprofen, to reduce fever, headache, and muscle aches Cough suppressants or lozenges for throat irritation Saline sprays or steam inhalation for congestion Avoid aspirin in children due to the risk of Reye’s syndrome. Antiviral Medications Antiviral drugs, such as: Oseltamivir (Tamiflu) Zanamivir (Relenza) Baloxavir (Xofluza) (not yet available in all regions) These medications work best when started within 48 hours of symptom onset. They may: Shorten illness by 1–2 days Reduce symptom severity Lower risk of complications like pneumonia Antivirals are especially recommended for: Elderly individuals (65+) Pregnant or postpartum women People with asthma, diabetes, heart disease, or weakened immune systems Hospitalised patients Hospital Treatment Severe cases may require: Oxygen therapy IV fluids for dehydration Antibiotics if secondary bacterial infections develop Close observation in intensive care units (for those with respiratory failure or complications) Alternative and Herbal Remedies While some people use vitamin C, echinacea, or zinc, evidence of their effectiveness is mixed. These should not replace proven treatments and may interfere with prescribed medications. Prevention is Key | Treatment of Flu Even effective treatment does not replace the value of prevention. Annual vaccination remains the most important tool for reducing the severity and spread of flu. The treatment of flu relies on timely care, rest, and—in higher-risk patients—early antiviral intervention. Most people recover fully, but knowing when to escalate care is essential. [Next: Complications of Flu →]

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Young girl with flu symptoms and tissue

Complications of Flu

Flu, Health Conditions /

Complications of Flu The complications of flu can be mild or life-threatening, depending on the individual’s health and immune status. Flu is more dangerous for young children, elderly people, pregnant women, and those with chronic illnesses. Even healthy individuals can experience complications if the virus weakens the immune system or leads to secondary infections. Respiratory Complications 1. Pneumonia The most serious complication Can be viral (from flu itself) or bacterial (secondary infection) Symptoms include chest pain, cough with mucus, shortness of breath, and high fever May require antibiotics, oxygen therapy, or hospitalisation 2. Bronchitis Inflammation of the bronchial tubes Causes persistent cough, fatigue, and chest tightness Usually resolves with rest but can lead to chronic lung issues in vulnerable groups Sinus and Ear Infections Sinusitis and otitis media are common, particularly in children Caused by fluid build-up and bacterial overgrowth May require decongestants or antibiotics Exacerbation of Chronic Illness People with asthma, COPD, heart disease, or diabetes may experience worsening of their condition Flu can trigger asthma attacks, heart strain, or unstable blood sugar levels Monitoring and medication adjustments are crucial during flu infection Neurological Complications (Rare) Encephalitis – inflammation of the brain, leading to confusion, seizures, or coma Guillain-Barré syndrome – a rare autoimmune condition causing muscle weakness or paralysis Febrile seizures in children with high fever Though rare, these complications require emergency care and hospitalisation. Muscle and Heart Inflammation Myositis (muscle inflammation) can cause severe pain and tenderness Myocarditis (inflammation of the heart) may lead to chest pain, irregular heartbeat, or heart failure These are uncommon but serious complications. Death | Complications of Flu Flu-related deaths occur every year, particularly in the elderly or immunocompromised. Most are due to pneumonia, sepsis, or heart complications. Seasonal flu causes thousands of deaths globally each year, many of which are preventable with vaccination. The complications of flu highlight the importance of prevention, early treatment, and protection of high-risk individuals. Although many recover without issue, flu remains a potentially serious illness that should not be underestimated. [Next: Back to Overview →]

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Measuring infant’s head for flat head syndrome

Flat Head Syndrome

Flat Head Syndrome, Health Conditions /

Flat Head Syndrome This condition, flat head syndrome refers to a condition where a baby’s head develops a flat spot. Typically due to prolonged pressure on one part of the skull. Flat head syndrome is medically known as positional plagiocephaly (flattening on one side of the back of the head) or brachycephaly (flattening across the entire back of the head). It is most noticeable in babies under one year old when the skull bones are still soft and mouldable. This condition has become more common since the introduction of safe sleep guidelines encouraging babies to sleep on their backs to reduce the risk of sudden infant death syndrome (SIDS). While these guidelines have saved lives, they have also increased the likelihood of uneven pressure on the baby’s head. Flat Head Syndrome Flat head syndrome is generally not dangerous and does not affect brain development. Most cases are mild and improve over time with simple changes to sleeping and positioning habits. However, in more severe cases, treatment such as physical therapy or helmet therapy may be recommended to reshape the head. Understanding flat head syndrome helps parents respond early and confidently. Reducing the need for intensive interventions and promoting healthy head shape development. Causes of Flat Head Syndrome The most common cause of flat head syndrome is sustained external pressure on one part of a baby’s skull, often from lying in the same position for extended periods. Babies have soft, flexible skull bones that are still forming, making them more susceptible to flattening. Other contributing factors include limited tummy time, a preference for turning the head to one side, and tight neck muscles—a condition known as torticollis. Premature babies are also at greater risk, as their skulls are even softer and they may spend longer periods lying down due to medical needs. Risk Factors and Prevention Several factors can increase the likelihood of a baby developing flat head syndrome. These include multiple births (such as twins). Which can result in limited space in the womb, or the use of infant car seats, bouncers, or swings for extended periods. Preventative measures focus on minimizing pressure on any one part of the head. Techniques include supervised tummy time while the baby is awake. Varying the baby’s head position during sleep, and regularly changing their position in the crib. Engaging with the baby from different angles also encourages natural head movement. When to Seek Medical Advice In most cases, flat head syndrome improves with simple at-home adjustments, but there are times when professional input is necessary. Parents should consult a healthcare provider if they notice that the flattening is severe. Furthermore, worsening, or not improving despite changes in positioning. A doctor may assess whether the flattening is positional or due to a rarer condition such as craniosynostosis. Where the skull bones fuse prematurely. In some cases, referrals to a paediatric physiotherapist or orthotist may be made for further evaluation or helmet therapy if appropriate. [Next: Causes of Flat Head Syndrome →]

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Premature baby in neonatal incubator with nasal feeding tube

Causes of Flat Head Syndrome

Flat Head Syndrome, Health Conditions /

Causes of Flat Head Syndrome The causes of flat head syndrome are primarily linked to pressure on a baby’s soft skull during early development. Flat head syndrome is not caused by anything parents have done wrong but often results from common positioning habits during sleep or rest. Prolonged Pressure on the Same Spot The most common cause is positional pressure on one part of the skull: Babies who spend long periods lying on their backs with their head turned to the same side Consistent use of car seats, bouncers, swings, or prams where the head rests against a hard surface Babies who prefer turning their head one way due to muscle tightness or habit The skull bones in infants are soft and flexible to accommodate rapid brain growth. This makes them vulnerable to flattening when pressure is applied consistently to one area. Torticollis A condition called congenital muscular torticollis can cause a baby to favour turning the head to one side due to tight neck muscles This can lead to persistent pressure on one part of the head and contribute to flattening Torticollis and flat head syndrome often occur together and should be treated in tandem Twin or Multiple Births Limited space in the womb can lead to pressure on the skull before birth Babies born in breech position or with low amniotic fluid may also be at higher risk Twins and triplets are more likely to have restricted movement and uneven head positioning Premature Birth Premature babies are at higher risk because their skulls are even softer than full-term infants They often spend more time lying on their backs in neonatal units, which adds to the risk Muscle tone and neck strength may also be underdeveloped, reducing their ability to change position Developmental and Medical Conditions Babies with delayed motor skills or medical conditions that limit movement may spend more time in one position Reduced movement leads to more pressure on specific areas of the skull Causes of Flat Head Syndrome Understanding the causes of flat head syndrome allows parents and caregivers to take preventive measures and ensure early intervention when needed. [Next: Symptoms of Flat Head Syndrome →]

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Baby with flat spot on head lying on soft blanket

Symptoms of Flat Head Syndrome

Flat Head Syndrome, Health Conditions /

Symptoms of Flat Head Syndrome The symptoms of flat head syndrome are usually visible rather than felt. Flat head syndrome does not cause pain or affect a baby’s intelligence or brain development. However, the physical appearance of the head may concern parents and, in some cases, may lead to longer-term cosmetic issues if left untreated. Visible Flattening of the Head Plagiocephaly presents as flattening on one side at the back of the head The head may appear asymmetrical when viewed from above One ear may appear pushed forward on the flattened side The forehead may also look more prominent on one side In brachycephaly, the flattening occurs across the back of the head, leading to: A wider, shorter skull shape The back of the head appearing more squared or upright The top of the head may appear taller in some cases The flattening is most noticeable when looking at the baby’s head from behind or above. Facial Asymmetry In more noticeable cases, the face may appear slightly uneven One eye may seem higher or more prominent than the other The cheeks may look fuller on one side These changes are usually mild and improve as the skull grows and reshapes Preference for Turning the Head One Way Babies may develop a habitual head position, preferring to look one way They may resist turning the head in the opposite direction This can be a sign of torticollis, which often accompanies flat head syndrome Delayed Motor Skills While not caused by the flattening itself, some babies with more severe flat head syndrome: May show slight delays in neck strength or rolling ability Have reduced tummy time tolerance, due to discomfort or unfamiliarity Tend to favour lying on their backs for long periods When to See a Doctor | Symptoms of Flat Head Syndrome Parents should speak to a healthcare provider if: The head shape does not improve by 4 to 6 months of age Flattening becomes more noticeable or severe The baby struggles to turn the head both ways There is concern about facial symmetry or development The earlier flat head syndrome is identified, the easier it is to treat. Most mild cases improve with repositioning, tummy time, and parental awareness. [Next: Diagnosis of Flat Head Syndrome→]

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Doctor examining baby for signs of flat head syndrome

Diagnosis of Flat Head Syndrome

Flat Head Syndrome, Health Conditions /

Diagnosis of Flat Head Syndrome The diagnosis of flat head syndrome is primarily clinical and based on the shape of the baby’s head. Most cases of flat head syndrome are identified by parents or during routine check-ups with a paediatrician or healthcare provider. Because it is a visible condition, no complex tests are usually needed unless other concerns arise. Physical Examination Doctors begin by: Observing the shape of the skull from different angles—above, behind, and sides Assessing whether the flattening is asymmetrical (plagiocephaly) or symmetrical (brachycephaly) Feeling the skull to determine soft spots (fontanelles), skull ridges, and bone alignment Measuring head circumference to ensure it is growing at a healthy rate If there is visible flattening without other concerning signs, the diagnosis is straightforward. Assessing Head Position and Movement Healthcare providers also evaluate: The baby’s ability to turn the head in both directions Presence of neck stiffness, which may suggest torticollis Overall muscle tone and motor development If the baby has a strong preference for turning the head one way, this could explain the uneven pressure causing flattening. Skull Measurements and Imaging In most cases, further testing is not necessary. However, in more complex or severe cases, doctors may use: Calliper measurements, to assess skull shape more precisely 3D imaging or digital scans, especially before considering helmet therapy X-rays or CT scans—rarely used—only if craniosynostosis (premature fusion of skull bones) is suspected Craniosynostosis is a separate and more serious condition that may resemble flat head syndrome but requires different treatment. Ruling Out Other Conditions Flat head syndrome must be distinguished from: Craniosynostosis – characterised by abnormal ridges, lack of soft spots, or restricted head growth Congenital conditions, such as facial asymmetry from in-utero positioning Neurological concerns, in rare cases where developmental delays are present If developmental delays or abnormal neurological signs are found, referral to a specialist (e.g. neurologist or developmental paediatrician) may be advised. Diagnosis of Flat Head Syndrome The diagnosis of flat head syndrome is usually simple and non-invasive. Early recognition allows for gentle, effective treatment strategies and helps avoid the need for more intensive interventions later. [Next: Treatment for Flat Head Syndrome →]

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Doctor examining baby for flat head syndrome treatment

Treatment for Flat Head Syndrome

Flat Head Syndrome, Health Conditions /

Treatment for Flat Head Syndrome The treatment for flat head syndrome depends on the severity of the flattening and the age of the baby. In most cases, flat head syndrome improves with non-invasive measures such as repositioning and supervised tummy time. Only a small number of babies with persistent or severe flattening need advanced treatments like helmet therapy. Repositioning Techniques Regularly change the baby’s head position during sleep (while still laying them on their back for safety) Alternate the baby’s position in the cot or pram to encourage turning the head in both directions Switch feeding arms or carrying positions to promote balanced neck movement Use rolled towels or wedges (under supervision) to reduce prolonged pressure on one side These techniques are most effective when started early—preferably before the baby is six months old. Tummy Time Supervised tummy time while the baby is awake helps build neck and shoulder strength Start with short sessions from birth and gradually increase as tolerated Encourages motor development and reduces the time spent on the back Tummy time is one of the most important strategies for preventing and treating flat head syndrome. Physical Therapy Doctors may recommend physiotherapy when torticollis (tight neck muscles) is present Exercises help improve neck mobility and muscle balance Healthcare providers often teach parents how to do gentle stretches and positioning at home Addressing torticollis early is key to resolving associated flat head syndrome. Helmet Therapy In moderate to severe cases that do not respond to repositioning: A custom-moulded helmet may be prescribed between 4 and 12 months of age It works by gently guiding skull growth while leaving space where reshaping is needed Worn for 20–23 hours per day, usually for a period of 2 to 6 months Helmet therapy is most effective when started early but may not be necessary for mild cases. Supportive Products (Use with Caution) Some parents use pillows, cushions, or head-shaping supports, but these are not recommended during sleep due to SIDS risk Always follow safe sleep guidelines: baby on back, flat firm surface, no soft bedding Treatment for Flat Head Syndrome The treatment of flat head syndrome focuses on early, gentle correction. In most cases, consistent care at home is enough to encourage natural improvement without the need for medical devices. [Next: Complications of Flat Head Syndrome →]

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