Monsoon season health tips usually get reduced to "bring an umbrella". But the rainy months change more than your commute: standing water breeds mosquitoes, floods carry bacteria, damp homes grow mould and colds seem to spread through every office on the same floor.
The good news is that the habits that matter most are fairly unglamorous: control standing water, keep your hands and feet clean and dry, sleep properly, and know when a fever needs a doctor. Here is what to prioritise when the northeast monsoon rolls in, and where a daily glass of TANO THRIVE fits: a nutritional top-up, not a shield.
Key takeaways
- Malaysia's northeast monsoon typically runs from around November to March, bringing the heaviest rain to the east coast of the Peninsula, Sabah and Sarawak.
- Dengue is the biggest rainy-season risk in urban areas. Aedes mosquitoes breed in small pools of clean, still water around homes.
- Wading through flood water carries a risk of leptospirosis. If you develop a fever afterwards, tell your doctor about the exposure.
- Sleep is an underrated immune habit. People sleeping under six hours were about four times more likely to catch a cold in one experimental study.
- Supplements are a supporting act. Vitamin C and zinc, like the 800 mg and 16 mg in a daily serving of TANO THRIVE, contribute to normal immune function but won't make you bulletproof.
Why do people get sick more in the rainy season?
Rain itself doesn't give you a cold. It is what rain changes around you:
- More breeding sites for mosquitoes, in drains, plant saucers, roof gutters and discarded containers.
- Floods that mix sewage and animal urine into water people walk through.
- More time indoors, in closed, air-conditioned rooms where respiratory viruses pass easily between people.
- Damp homes and clothes, which encourage mould and fungal skin infections.
- Disrupted routines: longer, jammed commutes, less outdoor exercise and later nights.
Monsoon season health tips: the priority list
1. Take dengue seriously
According to the WHO, dengue has surged globally over the past two decades, and Southeast Asia carries a large share of cases. Aedes mosquitoes bite mainly during the day, especially early morning and late afternoon, and lay eggs in containers of clean water. Their eggs can survive dry spells for months, then hatch when the rain returns.
Malaysian public health campaigns keep repeating one message: search for and destroy breeding sites. The easiest way to make that a habit is a weekly 10-minute sweep of your home. Check:
- Plant pot saucers and vases
- Roof gutters and air-conditioner drip trays
- Pet water bowls (refresh daily)
- Buckets, tyres, bottle caps and anything that holds a puddle
- Covered water tanks and pails in bathrooms
Use repellent containing DEET, picaridin or IR3535 when outdoors, and wear light, long sleeves at dawn and dusk if you live near construction sites or parks.
Know the warning signs. Dengue often starts with a high fever, headache, pain behind the eyes and body aches. The dangerous phase can arrive as the fever drops, usually around days 3–7. Seek urgent care for severe abdominal pain, persistent vomiting, bleeding gums or nose, blood in vomit or stools, or extreme tiredness and restlessness. Avoid ibuprofen and aspirin unless a doctor says otherwise; paracetamol is the usual choice for fever.
2. Treat flood water as contaminated
Leptospirosis is a bacterial infection spread mainly through water or soil contaminated with the urine of infected animals, particularly rats. It enters through cuts, grazes and the eyes, nose or mouth. Symptoms include fever, headache, muscle pain (often in the calves) and red eyes, and can appear anywhere from a few days to about a month after exposure.
- Avoid wading or swimming in flood water where possible.
- Wear boots and cover cuts with waterproof plasters if you must go in.
- Wash thoroughly with soap afterwards.
- If you get a fever in the following weeks, tell your doctor about the flood exposure. It changes what they test for.
Also discard food that has touched flood water, and boil drinking water if your supply may be affected.
3. Wash your hands like you mean it
It is basic because it works. The WHO and CDC recommend scrubbing with soap for at least 20 seconds, especially before eating, after the toilet and after using public transport. Hand sanitiser (at least 60% alcohol) is a decent backup, but it is less effective on visibly dirty hands.
4. Guard your sleep
In a 2015 study published in the journal Sleep, researchers measured volunteers' sleep for a week, then exposed them to a cold virus. Those who slept less than six hours a night were about 4.2 times more likely to develop a cold than those sleeping more than seven. Rainy nights are good for sleep, so use them. Our guide to sleeping better in Southeast Asia has practical tips.
5. Keep feet and skin dry
Wet shoes, damp socks and humid offices are ideal conditions for athlete's foot and other fungal infections. Keep a spare pair of socks at work, dry shoes properly between wears and dry skin folds after showering.
6. Deal with damp at home
WHO guidelines on indoor air quality link damp and mould to more respiratory symptoms and worse asthma. Dry laundry fully (a dehumidifier or aircon's dry mode helps), fix leaks quickly and wipe early mould spots before they spread.
What about vitamins for immunity?
Nutrition supports your immune system, but let's be precise about what the evidence says.
| Nutrient | What the evidence shows | Food sources |
|---|---|---|
| Vitamin C | A Cochrane review found regular supplements did not reduce how often most people catch colds, but slightly shortened their duration (about 8% in adults). | Guava, papaya, oranges, capsicum, broccoli |
| Zinc | Needed for normal immune cell function. Some trials suggest zinc lozenges started early may shorten colds, but results vary. | Shellfish, beef, chicken, pumpkin seeds, legumes |
| Vitamin D | A 2017 BMJ meta-analysis found supplements modestly reduced acute respiratory infections, with the clearest benefit in people who were deficient. | Oily fish, eggs, sensible sun exposure |
A varied diet should cover most needs. If your eating is patchy during a busy season, a supplement can fill small gaps (more on how TANO THRIVE fits below). For the details, see our explainers on vitamin C beyond colds and zinc and immunity.
One more: if you are in a higher-risk group (older adults, people with chronic conditions, pregnant women), ask your doctor about the annual flu vaccine. In the tropics, influenza circulates year-round.
A rainy-season checklist
- Weekly 10-minute standing-water sweep at home
- Mosquito repellent in your bag
- Spare socks and a small towel at the office
- Waterproof plasters for cuts
- Paracetamol and a working thermometer at home
- Seven or more hours of sleep on most nights
- Water bottle at your desk, since aircon and less heat mean you drink less
- Emergency numbers and your nearest clinic saved in your phone
Where TANO fits: THRIVE as a rainy-season top-up
None of the big monsoon risks above (dengue, leptospirosis, mould) is solved by a supplement. Repellent, a dry home, clean hands and sleep do that work. What a supplement can do is keep your nutrition steady when rainy-season routines get patchy.
One daily serving of TANO THRIVE (2 tablets) gives 800 mg vitamin C and 16 mg zinc, which contribute to the normal function of the immune system, as does its 100 mcg selenium. You also get 20 mg iron and vitamins B6 (6 mg) and B12 (18 mcg), which contribute to normal energy-yielding metabolism. For context, 800 mg of vitamin C is generous but within the NIH's 2,000 mg adult upper limit, and 16 mg zinc is well under the 40 mg limit. As the Cochrane findings in the table show, though, vitamin C won't stop you catching a cold.
Dissolve it in 250–500 ml cold water once daily, which also nudges up your water intake on cool aircon days. Don't stack it with other zinc or iron supplements without checking, and speak to your doctor first if you are pregnant, breastfeeding, on medication or managing a condition. Shop TANO THRIVE
This article is general information, not medical advice. If you have a high fever, especially after flood exposure or during a dengue outbreak, see a doctor promptly. Speak to a doctor or pharmacist before starting supplements, especially if you are pregnant, on medication or managing a health condition.
Frequently asked questions
When is monsoon season in Malaysia?
Malaysia has two main monsoons. The northeast monsoon usually runs from about November to March and brings the heaviest rain to the east coast states of Peninsular Malaysia, Sabah and Sarawak. The southwest monsoon, from about May to September, is generally drier. MetMalaysia publishes current forecasts and warnings.
Does TANO THRIVE protect against dengue or colds?
No. TANO THRIVE is a food supplement: its 800 mg vitamin C and 16 mg zinc per daily serving contribute to normal immune function, but no supplement protects you from dengue or guarantees you won't catch a cold. Removing standing water, using repellent, good hand hygiene and enough sleep matter far more, and any high fever in the rainy season should be checked by a doctor.
Why is dengue worse in the rainy season?
Rain creates more pools of still water where Aedes mosquitoes lay eggs, and their eggs can survive dry periods before hatching when wet again. More mosquitoes mean more chances for the virus to spread. Removing standing water around your home every week is one of the most effective things you can do.
What should I do if I walked through flood water?
Wash with soap and clean water as soon as you can, and clean and cover any cuts. Watch for fever, headache, muscle aches or red eyes over the next few weeks. If they appear, see a doctor and mention the flood exposure so they can consider leptospirosis.
Does vitamin C prevent colds?
Not for most people. A Cochrane review found regular vitamin C supplements did not reduce how often the general population catches colds, but slightly shortened how long colds last. Vitamin C contributes to normal immune function, so getting enough from food or a supplement is still worthwhile.
Can getting caught in the rain make you sick?
Colds and flu are caused by viruses, not by getting wet. That said, rainy weather pushes people indoors together, where viruses spread more easily. Changing out of wet clothes promptly also helps you avoid fungal skin problems.
Sources
- World Health Organization: Dengue and severe dengue fact sheet
- US Centers for Disease Control and Prevention: Leptospirosis
- NIH Office of Dietary Supplements: Vitamin C fact sheet
- NIH Office of Dietary Supplements: Zinc fact sheet
- Malaysian Meteorological Department (MetMalaysia)
- MyHEALTH portal, Ministry of Health Malaysia