Fever is one of the most common symptoms of infections and illnesses. Learn about fever causes, symptoms, treatments, home remedies, and when to seek medical help.
Fever — a rise in body temperature above the normal 37°C (98.6°F) — is one of the most common symptoms of illness worldwide. Fever is the body’s natural response to infection or illness. It happens when the immune system releases chemicals that raise body temperature to help fight off viruses and bacteria.
High fever: Above 39°C (102°F).
Normal body temperature: Around 37°C (98.6°F).
Low-grade fever: 37.5–38°C (99.5–100.4°F).
Common Causes of Fever
- Viral infections: Cold, flu, COVID-19.
- Bacterial infections: Strep throat, urinary tract infections, pneumonia.
- Inflammatory conditions: Rheumatoid arthritis, autoimmune diseases.
- Heat-related illness: Heat exhaustion or heatstroke.
- Vaccinations: Some vaccines may cause mild fever as a side effect.
Symptoms That Often Accompany Fever
Fever rarely comes alone — it is usually paired with other signs that give clues about what’s going on in the body:
- Sweating and chills – your body switches between feeling hot and cold.
- Body aches and fatigue – muscles feel sore and energy levels drop.
- Headache – pressure or throbbing pain in the head.
- Loss of appetite – less desire to eat than usual.
- Dehydration – dry mouth, thirst, or reduced urination.
- Irritability in children – fussiness, crying, or restlessness.
Remedies for Fever Relief
- Stay hydrated – water, clear soups, and electrolyte solutions.
- Rest – allow the body to recover.
- Light clothing and cool environment – avoid overheating.
- Cool compresses – apply to forehead or neck.
- Over-the-counter medications – paracetamol (acetaminophen) or ibuprofen can help lower fever (Always consult a doctor or pharmacist before giving medication, especially to children)
When to See a Doctor
Most fevers are mild and go away on their own, but some situations require medical attention to rule out serious illness:
- Fever lasting more than 3 days.
- Very high fever (above 39.5°C / 103°F).
- Fever in infants younger than 3 months.
- Accompanied by severe headache, confusion, rash, breathing difficulty, or chest pain.
- Repeated fevers with no clear cause.
Prevention Tips
- Wash hands regularly.
- Stay up-to-date with vaccinations.
- Avoid close contact with sick individuals.
- Maintain a healthy lifestyle to strengthen immunity.
FAQ
- What temperature counts as a fever? A fever is generally considered a body temperature of 37.5°C (99.5°F) or higher.
- Is fever always a sign of infection? Most fevers are due to infections, but they can also be caused by inflammation, heat exhaustion, or medication side effects.
- How can I reduce a child’s fever at home? Keep them hydrated, dressed lightly, and give fever-reducing medicine only as directed by a doctor.
- When is fever dangerous? Fever is dangerous if it’s very high, lasts several days, or is accompanied by alarming symptoms like confusion, seizures, or breathing difficulties.
Fever is one of the body’s most important defense mechanisms, often a sign that the immune system is working. While most fevers are mild and manageable at home, persistent or severe fevers need medical attention.
Disclaimer: This article is for educational purposes only and should not replace professional medical advice. Always consult a healthcare provider for proper diagnosis and treatment.