Monsoon Fever: Is It Dengue, Malaria or Just Viral?

By Dr. Rajeev Agarwal, M.D. (Paediatrics), ADHA, PGDMLS · Medical Director, Shree Kkasturi Medicare Pvt. Ltd. Published: 22 August 2026 · Medically reviewed: 22 August 2026

It is the third day of fever. The paracetamol works for four hours and then the temperature climbs again. Someone in the family says it is "just viral". Someone else says get the platelet count checked. You are not sure whether to wait one more day or go to a hospital tonight.

Every monsoon in Mira-Bhayander, we see this exact uncertainty in the casualty department. The honest answer is that you cannot reliably tell these fevers apart at home — but you can learn which patterns are worrying and which are not, and you can learn the handful of signs that mean the waiting is over.

What causes most fevers during the Mumbai monsoon?

Four groups account for the majority: mosquito-borne illness (dengue, malaria, chikungunya), water-borne illness (typhoid, hepatitis A and E, gastroenteritis), leptospirosis from contact with floodwater, and ordinary viral fevers including influenza. They overlap heavily in the first two days, which is why early diagnosis by symptoms alone is unreliable.

Here is how they typically differ once they declare themselves:

Note what is missing from that table: certainty. A first-day dengue and a first-day viral fever can look identical. This is why we test rather than guess.

Which blood tests actually help, and when?

Timing matters more than the number of tests. A dengue NS1 antigen test is most useful in the first five days of fever; the dengue IgM antibody becomes useful only after day five. A malaria rapid test and a peripheral blood smear are best taken during or just after a fever spike. A complete blood count is worth repeating rather than doing once.

The single most common mistake we see is testing too early and being falsely reassured. A normal report on day one means very little. If fever continues, the tests need to be repeated — usually a repeat CBC on day 3 and again on day 5.

The second most common mistake is watching only the platelet count. Platelets are one number among several. A falling platelet count alongside a rising haematocrit matters far more than a platelet figure on its own, and a patient with a platelet count of 60,000 who is drinking well and passing urine normally is often in a much safer position than one at 90,000 who is vomiting and cannot keep fluids down.

At Shree Kkasturi Medicare, the pathology laboratory runs 24×7, so a fever that worsens at 11 PM does not have to wait until the morning for a blood count.

What should I do at home while I wait?

Three things help, and three things cause harm.

Do:

• Paracetamol only, at the dose your doctor has advised, for fever and pain.

• Fluids, constantly. ORS, coconut water, dal water, rice kanji, plain water. The single best home measure in dengue is aggressive oral hydration.

• Watch the urine. Passing pale urine every few hours is a reassuring sign. Reducing urine, or dark concentrated urine, is not.

Do not:

• Do not take ibuprofen, diclofenac, aspirin or combination painkillers until dengue has been ruled out. These increase bleeding risk and can worsen a dengue illness significantly. This includes the common over-the-counter combination tablets people take for body ache.

• Do not start antibiotics on your own. They do nothing for dengue, viral fever or chikungunya, and taking them blindly makes the eventual diagnosis harder.

• Do not rely on papaya leaf extract to "raise platelets". The evidence for it is weak and inconsistent. It is not a substitute for hydration, monitoring, or medical review — and families who trust it sometimes delay coming in.

When should I stop waiting and come to hospital?

Come to a casualty department immediately, at any hour, if any one of these appears:

• Severe abdominal pain, or a tender abdomen

• Persistent vomiting — unable to keep fluids down

• Any bleeding — gums, nose, black stools, blood in vomit, unusual bruising, heavy menstrual bleeding

• Breathlessness or fast breathing

• Drowsiness, confusion, unusual irritability, or a seizure

• Cold, clammy hands and feet, or pale, mottled skin

• A sharp fall in urine output — not passing urine for 8 hours or more

• Yellow eyes or yellow urine

• Fever continuing beyond five days without a diagnosis

Two additional situations that need same-day review even without the above: fever in a baby under three months of age, and fever in someone who is pregnant, on dialysis, on cancer treatment, on steroids, or has poorly controlled diabetes or heart disease.

There is a specific trap in dengue worth stating plainly. The patient often feels better as the fever comes down on day four or five — and that is exactly when the critical phase begins. A drop in temperature is not, by itself, recovery. If the fever settles but the abdominal pain, vomiting or restlessness increases, that is a warning sign and needs review the same day.

How do I stop this happening in the first place?

Dengue's mosquito, Aedes, breeds in clean stagnant water inside and around the home, and bites during the day — so a bed net at night is not enough protection.

• Keep one dry day a week: empty, scrub and dry every water storage drum, bucket and tank.

• Check the places people forget: air-conditioner and refrigerator drip trays, money-plant bottles, flower pot saucers, terrace tarpaulins, discarded tyres, and coconut shells in the compound.

• Keep all stored water covered.

• Use repellent and full-sleeved clothing, particularly in the early morning and late afternoon.

• Do not wade through flood water. If you must, wear covered footwear, and wash your legs with soap immediately afterwards. If you have any cut or abrasion on your foot and you have walked through flood water, tell a doctor — leptospirosis is preventable if addressed early.

• Drink boiled or properly filtered water only. Avoid cut fruit, juices and salads from outside during the monsoon.

• If you are due for a typhoid or influenza vaccination, this is the season it earns its keep.

Frequently asked questions

Q. My platelet count is 80,000. Do I need admission? A. Not necessarily. Admission is decided on your overall condition — whether you can drink and retain fluids, your blood pressure and pulse, urine output, and whether any warning sign is present — not on a single platelet number. Many patients with counts in this range are managed at home with daily review.

Q. Does everyone with dengue need a platelet transfusion? A. No. The large majority of dengue patients never need a platelet transfusion. It is reserved for specific situations such as active significant bleeding. Unnecessary transfusion carries its own risks. Fluid management, not transfusion, is the mainstay of dengue treatment.

Q. My fever went away on its own after four days. Do I still need to see a doctor? A. If you had a high fever for several days during the monsoon, a review is sensible — particularly in dengue, where the days after the fever settles are the ones that matter. If you feel entirely well, are eating and passing urine normally, and have no warning signs, a routine OPD visit is enough.

Q. Can I get dengue twice? A. Yes. There are four dengue serotypes, and infection with one gives lasting protection only against that type. A second infection with a different serotype can be more severe, which is why a past history of dengue is something you should tell your doctor.

Q. How long does the weakness last after dengue? A. Fatigue commonly persists for two to four weeks after the fever resolves, and low mood or poor appetite during this period is common and expected. If weakness is worsening rather than slowly improving, get reviewed.

Q. Is it safe to bring a feverish child out at night? A. Yes — if a warning sign is present, delay is the greater risk. Casualty departments are open through the night for exactly this reason.

Shree Kkasturi Medicare Pvt. Ltd. is a 45-bed NABH Entry Level accredited multispecialty hospital in Bhayander West, serving Mira-Bhayander since 2001. Our 24×7 casualty department, 24×7 pathology laboratory, ICU, NICU and paediatric services are available through the night and on holidays. Free ambulance pick-up is available.

Disclaimer: This article provides general health information and is not a substitute for consultation, examination or diagnosis by a qualified doctor. Do not use it to diagnose or treat yourself or a family member. If you have symptoms, please consult a physician. In an emergency, go to the nearest casualty department immediately.