A fever during the monsoon in India could be dengue, malaria, typhoid, leptospirosis or viral hepatitis, and the early symptoms overlap so much that only a blood test can tell them apart. What you can do at home is notice the clues (how the fever started, whether you waded through floodwater, whether your eyes or urine turned yellow) and know the warning signs that mean you need a doctor the same day.
Below is a side-by-side table of the common rainy-season infections, then what to take (and avoid) for fever, how to prevent each one, and the red flags.
Why the rains bring these infections
Monsoon infections in India fall into three groups:
- Mosquito-borne: dengue and malaria. Rainwater collects in coolers, flower pots, tyres and construction sites, and mosquitoes breed in it.
- Water- and food-borne: typhoid, hepatitis A, hepatitis E and cholera. Flooded drains and leaking pipes let sewage get into drinking water.
- Floodwater-borne: leptospirosis, which spreads through water or mud contaminated with the urine of infected animals, especially rats.
How to tell monsoon infections apart
The table pulls together what WHO, the CDC and other health agencies say about each infection. Use it to understand the clues, not to diagnose yourself.
| Infection | How you catch it | Time to symptoms | Typical clues | Main danger |
|---|---|---|---|---|
| Dengue | Bite of a day-biting Aedes mosquito | 4 to 10 days | High fever (up to 40°C), severe headache, pain behind the eyes, muscle and joint pain, rash | Severe dengue, often after the fever settles |
| Malaria | Bite of an infected Anopheles mosquito | About 10 to 15 days | Fever, chills and headache | P. falciparum malaria can turn severe within 24 hours |
| Leptospirosis | Contact with floodwater or mud carrying animal urine, especially through cuts | 2 to 30 days | Fever, chills, headache, muscle aches, red eyes, sometimes jaundice | Kidney or liver failure, meningitis, breathing trouble |
| Typhoid | Contaminated food or water | Varies | Fever that lasts more than 3 days and can reach 39 to 40°C, weakness, stomach pain, constipation or diarrhoea | Serious complications if untreated |
| Hepatitis A | Food or water contaminated with faeces | 14 to 28 days | Fever, tiredness, nausea, loss of appetite, dark urine, yellow eyes | Acute liver failure; severe illness is more likely in older adults |
| Hepatitis E | Contaminated drinking water | 2 to 10 weeks | Mild fever and nausea for a few days, then jaundice, dark urine, pale stools | Very dangerous in pregnancy |
| Cholera | Contaminated water or food | 12 hours to 5 days | Sudden, heavy watery diarrhoea | Dehydration that can kill within hours |
Sources for the table: WHO fact sheets on malaria, typhoid, hepatitis A, hepatitis E and cholera; the CDC on leptospirosis and typhoid symptoms.
A few clues that point one way or another
- Pain behind the eyes and a rash lean towards dengue.
- Fever with shivering chills is the classic malaria pattern, though leptospirosis can cause chills too.
- Waded through a flooded street or cleaned out a drain in the last month? Tell the doctor. Leptospirosis is easy to miss unless they know.
- A high fever lasting more than 3 days, with stomach pain and constipation or loose motions, fits typhoid.
- Yellow eyes and dark urine point to hepatitis A or E, though leptospirosis and severe malaria can also cause jaundice.
- Sudden, heavy watery diarrhoea is the hallmark of cholera, and needs fluids straight away.
These are only leanings. Symptoms overlap, and the textbook pattern often doesn’t show up. Your doctor will choose the blood tests based on your symptoms and how many days you’ve had fever.
Fever medicine: why paracetamol, and why caution
For monsoon fever, paracetamol is the usual choice, and WHO’s dengue guidance says to avoid ibuprofen, aspirin and similar painkillers because they raise the risk of bleeding. Since you can’t rule out dengue at home, skip those painkillers until a doctor has seen you.
Paracetamol isn’t free of risk either. WHO’s hepatitis fact sheets advise avoiding unnecessary medicines that can strain the liver, paracetamol included, once hepatitis A or E is confirmed. So take only what you need for comfort, stick to the dose on the pack, and tell your doctor how much you’ve taken. If your eyes turn yellow, ask your doctor before taking any more.
If you’ve been diagnosed with dengue, our guide to dengue platelet counts explains what the numbers on your report mean.
Preventing mosquito-borne infections
- Empty, scrub and cover anything that holds water at least once a week: cooler trays, plant saucers, buckets, old tyres, the fridge drip tray. WHO recommends weekly cleaning of water storage containers.
- Dengue mosquitoes bite in the daytime, so protection matters at school and at work as well as at night.
- Use a repellent with DEET, picaridin or IR3535, wear long sleeves, and fit window and door screens.
- Sleep under a mosquito net. Babies and anyone sleeping during the day should be under one too.
Preventing water- and food-borne infections
- Drink boiled or properly treated water, and avoid ice unless you know it came from safe water.
- Eat food that has been cooked well and served hot. Be wary of cut fruit and chutneys from roadside stalls during heavy rains.
- Wash or peel fruit and vegetables, and drink only boiled or pasteurised milk. Our article on the risks of raw milk explains why.
- Wash hands with soap before eating and after using the toilet.
- Keep oral rehydration solution (ORS) at home. WHO says most people with cholera recover with ORS. More on loose motions in our guide to common causes of diarrhoea.
Vaccines exist for some of these. WHO notes that a single dose of typhoid conjugate vaccine can be given from 6 months of age, and that hepatitis A vaccines are available for children over 1 year and adults. Ask your paediatrician or family doctor whether they’re right for your family.
Preventing leptospirosis
The CDC advises:
- avoid wading or swimming in floodwater, especially after heavy rain
- cover cuts and scrapes with waterproof dressings
- wear gumboots and waterproof clothing if you have to walk through water or clear mud
- control rats around the home and keep food and grain covered
Early antibiotics can prevent severe leptospirosis, so if you develop fever within a few weeks of floodwater contact, see a doctor and mention it.
When to see a doctor, and when to call 112
See a doctor the same day if a monsoon fever lasts more than 2 days, if you’re pregnant, or if the patient is a young child or an older adult. Go to hospital or call 112 for any of these:
- severe stomach pain, repeated vomiting, or bleeding from the gums or nose, especially as the fever comes down (dengue warning signs from WHO)
- blood in vomit or stools, cold clammy skin, or extreme restlessness or drowsiness
- confusion, fits, very dark or bloody urine, or difficulty breathing (signs of severe malaria)
- yellow eyes in a pregnant woman. WHO warns that up to 20 to 25% of pregnant women who get hepatitis E in the third trimester can die
- heavy watery diarrhoea with sunken eyes, very little urine, or weakness that makes it hard to drink
- fever with reduced urine after floodwater exposure, which can signal kidney involvement in leptospirosis
For a broader look at viral illnesses during the rains, see common monsoon viral infections.
Frequently asked questions
Which monsoon fever is the most dangerous?
Each one can be serious. Falciparum malaria can become life-threatening within 24 hours, severe dengue often strikes as the fever settles, cholera can kill through dehydration within hours, and hepatitis E is especially dangerous in pregnancy. That’s why early testing matters more than guessing.
Can I take ibuprofen for a monsoon fever?
Not until dengue is ruled out. WHO advises against ibuprofen and aspirin in dengue because they increase bleeding risk. Use paracetamol at the dose on the pack, and ask your doctor.
Is jaundice in the monsoon always hepatitis?
No. Hepatitis A and E are common causes, but leptospirosis and severe malaria can also turn the eyes yellow. A doctor will need blood tests to find the cause.
Does boiling water really prevent typhoid and hepatitis?
Boiling questionable water is one of the measures WHO recommends against typhoid, and safe water is the main defence against hepatitis E and cholera. It doesn’t help if the food, ice or milk you consume is contaminated, so those need care too.
Can leptospirosis spread from person to person?
Rarely. The CDC says person-to-person spread is rare; people usually catch it through water, soil or food contaminated with the urine of infected animals. The bacteria can survive in water or soil for weeks to months.
This article is for general information and is not a substitute for advice from a doctor. If you have symptoms or a health condition, please consult a qualified healthcare professional.
