Every year between June and September, India's monsoon brings relief from the summer heat — and a predictable surge in preventable illness. In my experience as a general physician, the weeks following the first heavy rains are among the busiest of the year. The good news: the vast majority of monsoon illnesses are avoidable with the right precautions, and the ones that aren't are very treatable when caught early.

Here is what I advise my patients every year as the clouds gather.

‍The illnesses that spike every monsoon
‍Dengue and malaria are the two conditions I'm most concerned about during this season. Both are mosquito-borne; both peak when stagnant water accumulates after rainfall. Dengue, in particular, has expanded its geographic range significantly over the past decade — it is no longer only a disease of urban slums. High fever, severe headache, pain behind the eyes, and joint and muscle ache are the hallmarks. If you have these symptoms during monsoon season, do not self-treat with paracetamol and wait it out. Get a dengue NS1 antigen test done in the first five days of fever. seeDoc can book this through SRL Diagnostics with no markup on the standard rate.

‍Leptospirosis is less discussed but increasingly common in urban areas with flooding. It spreads through contact with water contaminated by animal urine — which becomes a significant risk when floodwater enters streets and homes. Symptoms mirror a flu: fever, headache, muscle aches. Severe cases involve the liver and kidneys. If you've waded through floodwater and develop a fever within two weeks, mention this to your doctor.

‍Viral gastroenteritis — stomach flu — peaks during monsoon because waterborne contamination is more common when drainage systems are overwhelmed. Oral rehydration is the cornerstone of treatment, but dehydration in young children and older adults can escalate quickly.

‍Respiratory infections rise during the rains due to temperature swings, increased indoor crowding, and viral spread. These are usually self-limiting but can progress to pneumonia in vulnerable patients.

‍Practical advice, in plain language
‍Don't let water stagnate anywhere near your home — coolers, plant pots, tyres, and even bottle caps. Mosquitoes breed in remarkably small quantities of standing water and a new generation can emerge within a week. Use nets and repellents consistently, not only when you notice mosquitoes.

Eat freshly cooked food. Street food that has been sitting out is higher risk during monsoon; the combination of heat, humidity, and handling creates ideal conditions for bacterial growth.

Ensure your drinking water is either boiled or filtered through a certified purifier. Municipal supply quality can deteriorate during heavy rainfall as infrastructure is stressed.

If you have children under five or elderly family members at home, keep their vaccination status current and be more vigilant about fever — both groups decompensate faster than healthy adults.

‍When to consult a doctor
‍Fever above 38.5°C lasting more than two days during monsoon season should be evaluated. Fever with rash, bleeding from gums or nose, severe vomiting, or inability to keep fluids down warrants urgent attention. A seeDoc video consultation can help you assess whether symptoms need in-person investigation, guide you to the right test, and provide a prescription if one is appropriate — without the waiting room exposure to other unwell patients.

The monsoon is one of India's greatest gifts. It doesn't have to come at a cost to your health.

seeDoc was featured in eHealth Magazine when it launched its video consultation platform, and the specialist video consultation feature has been a core part of the platform's preventive health work, including digital efforts to arrest lifestyle disorders across India.