Kerala is once again stepping into the most delicate part of the monsoon calendar: the weeks when heavy rain, waterlogging, humidity, and contaminated water sources can quickly turn a weather event into a public-health concern.
The Kerala State Disaster Management Authority has issued yellow alerts for several districts, warning of isolated heavy rainfall. According to the official update issued at 1.00 PM on May 25, 2026, yellow alerts were listed for Pathanamthitta, Alappuzha, Kottayam, Idukki, Ernakulam and Thrissur on May 25; Thiruvananthapuram, Kollam, Alappuzha and Ernakulam on May 26; and Thiruvananthapuram, Kollam and Alappuzha on May 27. The alert defines heavy rainfall as 64.5 mm to 115.5 mm in 24 hours.
“In Kerala, the monsoon is not just a weather season. It is also a hygiene season, a nutrition season, and a disease-prevention season.”
The immediate worry is not rain alone. It is what follows rain: overflowing drains, damp kitchens, unsafe drinking water, mosquito breeding, contaminated street food, and delayed medical attention for fever. The India Meteorological Department has also indicated favourable conditions for the further advance of the southwest monsoon, with heavy rainfall expected over Kerala and Mahe during parts of this week.
Kerala’s public-health system is familiar with this cycle. The Directorate of Health Services lists treatment protocols for dengue fever, leptospirosis, malaria, scrub typhus and short febrile illness, reflecting how seriously the state monitors monsoon-linked communicable diseases.
The first defence: safe water
During heavy rain, even households with usually reliable water sources must assume risk. Wells, storage tanks, pipes, and roadside water points can be contaminated by runoff, sewage leakage, or floodwater intrusion.
Families should drink only boiled, filtered, or properly treated water. Water stored in vessels should be covered, ladles should be clean, and old stored water should not be mixed with freshly boiled water.
“The safest glass of water in the monsoon is not the one that looks clean; it is the one that has been made safe.”
Children, pregnant women, elderly people, and those with diabetes, kidney disease, liver disease, or low immunity should be especially cautious. Loose stools, vomiting, fever, yellowing of the eyes, abdominal pain, or unusual tiredness after consuming outside food or unsafe water should not be ignored.
Common monsoon-related water-borne illnesses include diarrhoeal disease, typhoid, hepatitis A, hepatitis E, and cholera-like gastroenteritis. These risks rise when drinking water, ice, cut fruits, chutneys, juices, and uncooked foods are exposed to contaminated water.
Food safety: the monsoon kitchen rulebook
The World Health Organization’s food-safety guidance is simple but highly relevant for monsoon households: keep clean, separate raw and cooked food, cook thoroughly, keep food at safe temperatures, and use safe water and raw materials.
For Kerala households, this means:
Cook rice, fish, meat, egg, and curries thoroughly. Avoid keeping cooked food at room temperature for long hours in humid weather. Reheat leftovers properly until steaming hot. Wash vegetables and fruits using safe water. Avoid raw salads from unknown food outlets. Do not consume cut fruits sold in the open. Avoid roadside juices, uncovered snacks, stale bakery items, and chutneys that may have been prepared with unsafe water.
Fish and seafood are common in Kerala diets, but during rainy spells they should be bought from trusted vendors, cooked fully, and eaten fresh. Half-cooked seafood or food stored in damp conditions can increase the risk of food poisoning.
“Monsoon food should be warm, fresh, cooked, covered, and simple. The more exposed the food, the higher the risk.”
Nutrition for immunity: not magic foods, but consistent meals
Immunity during the monsoon is not built by one “superfood.” It is supported by regular meals, enough protein, hydration, micronutrients, and gut-friendly food habits.
A practical monsoon plate should include cooked rice or millet, dal or pulses, eggs, fish or lean protein where suitable, cooked vegetables, curd if tolerated, seasonal fruits washed safely, and warm fluids. Traditional Kerala foods such as kanji, cherupayar, rasam, vegetable thoran, steamed dishes, and lightly spiced soups can be useful because they are warm, digestible, and easy to prepare fresh.
Vitamin C-rich foods such as guava, amla, citrus fruits, and safely washed fruits can support general health. Protein from dal, pulses, egg, fish, paneer, curd, chicken, or sprouts that are cooked properly helps maintain immune function. Iron-rich foods such as greens, legumes, fish, and meat should be balanced with vitamin C sources for better absorption.
But the key is moderation. Heavy, oily, repeatedly reheated, or unhygienic food can upset digestion during humid weather. People with diabetes, kidney disease, cardiac conditions, pregnancy, or chronic illness should follow their clinician’s dietary advice rather than adopting viral “immunity booster” trends.
Vector-borne diseases: dengue and mosquito control
Heavy rain creates stagnant water pockets in coconut shells, plant trays, discarded tyres, roof gutters, buckets, open tanks, construction sites, and unused containers. These can become mosquito breeding sites.
Dengue prevention depends heavily on source reduction. Households should empty and dry water-holding containers at least once a week, cover water tanks, clean terraces and drains, use mosquito nets or repellents, and keep children in protective clothing during peak mosquito hours.
Fever with severe body pain, headache, pain behind the eyes, rash, vomiting, bleeding, abdominal pain, dizziness, or extreme weakness needs medical evaluation. Self-medication with painkillers can be risky in suspected dengue; medical advice is important.
“Every household can become a small public-health unit during the monsoon. Emptying one container of stagnant water may prevent more illness than treating fever later.”
Leptospirosis: the rainwater disease Kerala cannot ignore
Leptospirosis, commonly called rat fever, is a major monsoon concern in Kerala because infection can occur when people come into contact with water or mud contaminated by urine from infected animals, especially rodents. Risk rises after flooding, cleaning of drains, agricultural work, wading through stagnant water, or walking through water with cuts or wounds.
People who must work in wet or flooded areas should use gumboots, gloves, and protective clothing. Cuts and abrasions should be covered. After exposure to dirty water, the body should be washed with soap and clean water.
Kerala’s health authorities maintain treatment guidelines for leptospirosis, and preventive medicine such as doxycycline may be advised for high-risk exposure groups under medical or public-health guidance. It should not be taken casually without appropriate advice.
When to seek medical care
During monsoon, fever should be watched carefully. Medical help is needed if fever lasts more than 24–48 hours, is associated with severe body pain, breathlessness, persistent vomiting, confusion, reduced urination, jaundice, bleeding, severe abdominal pain, dehydration, or extreme fatigue.
Children, pregnant women, elderly people, and people with chronic diseases should seek care earlier. Delayed diagnosis can worsen dengue, leptospirosis, typhoid, hepatitis, and severe diarrhoeal illness.
A household monsoon checklist
Before the next spell of rain, families should clean water tanks, chlorinate or disinfect wells where needed, check drinking-water sources, clear drains, remove stagnant water, stock oral rehydration salts, keep basic fever supplies ready, and ensure elderly family members have their regular medicines.
Food vendors, schools, offices, hostels, and apartments must also treat monsoon health as a shared responsibility. Safe drinking water, clean toilets, covered food, dry waste handling, and mosquito-source control are not optional during the rainy season.
Kerala has learned, again and again, that monsoon preparedness is not just about umbrellas and flood warnings. It is about the ordinary decisions made in homes: boiling water, covering food, drying containers, cleaning drains, wearing footwear, and seeing a doctor before a fever turns dangerous.
“The monsoon will bring rain. Whether it also brings disease depends on how early families, communities, and institutions act.”
