From seasonal flu to dengue and typhoid — know the symptoms of the most common illnesses in India, when to seek medical care, and how to protect yourself and your family.
India's climate and density make it one of the most diverse environments for infectious and lifestyle diseases. Understanding the most common conditions — their symptoms, causes, and danger signs — is the first step in protecting your health.
1. Dengue Fever
Dengue is caused by the dengue virus transmitted by the Aedes aegypti mosquito, most active during and after monsoon season (July–October).
Key symptoms:
- Sudden high fever (104°F / 40°C)
- Severe headache and pain behind the eyes
- Muscle and joint pain ("breakbone fever")
- Skin rash appearing 2–5 days after fever
- Mild bleeding — nosebleeds, bleeding gums
- Fatigue and nausea
See a doctor immediately if you notice persistent vomiting, severe abdominal pain, blood in urine/stool, or rapid breathing — these are signs of severe dengue.
2. Typhoid
Typhoid is a bacterial infection caused by Salmonella typhi, spread through contaminated food and water. It is particularly common in areas with poor sanitation.
Key symptoms:
- Prolonged fever (up to 40°C) lasting 3–4 weeks
- Headache and body aches
- Loss of appetite and abdominal pain
- Rose-coloured spots on the chest
- Constipation or diarrhoea
- Fatigue and weakness
Typhoid can be life-threatening if untreated. Always complete the full antibiotic course prescribed by your doctor even if you feel better early.
3. Malaria
Malaria is caused by Plasmodium parasites carried by female Anopheles mosquitoes. It remains one of the top causes of fever-related hospital visits in tropical India.
Key symptoms:
- Cyclic high fever with chills and sweating
- Headache and muscle pain
- Nausea and vomiting
- Anaemia and jaundice in severe cases
4. Common Cold & Flu (Influenza)
Respiratory infections spike during seasonal transitions (October–February). While a cold is usually mild, influenza can cause complications in the elderly, children, and people with chronic conditions.
Flu symptoms (more severe than cold):
- Sudden fever above 38°C
- Severe body aches
- Dry cough
- Sore throat and runny nose
- Headache, fatigue
- Occasional vomiting/diarrhoea in children
5. Conjunctivitis (Eye Flu)
Conjunctivitis spreads extremely fast in schools and workplaces during monsoon. It is usually viral and resolves in 7–14 days.
Symptoms:
- Red, watery eyes
- Itching or burning sensation
- Discharge causing eyelids to stick together
- Light sensitivity
6. Gastroenteritis (Stomach Flu)
Often caused by contaminated food or water, gastroenteritis leads to millions of hospital visits annually in India, especially in summer and monsoon.
Symptoms:
- Diarrhoea (3+ loose stools per day)
- Nausea and vomiting
- Abdominal cramps
- Low-grade fever
- Dehydration — dry mouth, reduced urination
For diarrhoea and vomiting, ORS (Oral Rehydration Solution) is critical to prevent dangerous dehydration, especially in children under 5.
When to Go to the Hospital Immediately
- Fever above 103°F (39.4°C) lasting more than 3 days
- Difficulty breathing or chest pain
- Confusion, drowsiness, or unresponsiveness
- Signs of severe dehydration
- Rash with fever in children
- Blood in urine, stool, or vomit