Phuket’s rainy season—from May to October—brings cooler weather, lush greenery, and unfortunately, a rise in seasonal illnesses. With increased humidity, stagnant water, and unpredictable temperatures, the risk of infection and disease spreads quickly. Whether you’re a local or traveler, it’s important to know what to watch out for in 2025, and how to stay safe.

 1. Dengue Fever

Why it spikes: Standing water from heavy rainfall is a breeding ground for Aedes mosquitoes, the main carriers of dengue.

Symptoms:

• High fever
• Severe headache
• Muscle and joint pain
• Skin rash

2025 Update:

New smart surveillance tools are being used by the Phuket health department to predict outbreaks and notify high-risk areas via mobile apps. Wear insect repellent and avoid peak mosquito hours (early morning and dusk).

2. Diarrhea & Foodborne Illnesses

Why it spikes: Street food and wet market items can spoil faster in high humidity, and floodwater often contaminates local water sources.

Symptoms:

• Stomach cramps
• Diarrhea or vomiting
• Dehydration

2025 Tip:

Many local clinics in Phuket now offer rapid stool tests and hydration stations. Stick to bottled or filtered water, and avoid raw or undercooked food.

3. Influenza

Why it spikes: Close contact indoors during storms and fluctuating temperatures weaken immunity and spread the flu virus.

Symptoms:

• Sudden fever
• Sore throat
• Muscle pain
• Fatigue

2025 Update:

Flu vaccines adapted for tropical strains are widely available at Phuket provincial hospitals and some tourist clinics. Wear masks in crowded areas during flu season.

4. Leptospirosis

Why it spikes: This bacterial infection spreads through water contaminated with infected animal urine, especially after floods.

Symptoms:

• High fever
• Chills
• Red eyes
• Muscle aches
• Sometimes jaundice

2025 Insight:

The Phuket municipality has launched awareness campaigns targeting flood-prone neighborhoods. Avoid walking in floodwater, and wear waterproof boots when possible.

5. Fungal Skin Infections

Why it spikes: Wet clothing and constant moisture can cause skin infections like athlete’s foot and ringworm.

Symptoms:

• Red, itchy patches
• Flaky or cracked skin
• Peeling between toes

2025 Tip : Dermatology clinics in Phuket recommend antifungal powders and airing your feet as part of rainy-season hygiene.

How to Stay Healthy During the Rainy Season (2025 Tips)

• Keep dry: Bring extra clothing and rain gear
• Stay informed: Use local health apps for outbreak alerts
• Visit clinics early: Don’t ignore symptoms
• Boost immunity: Eat well, rest, and consider seasonal supplements

Final Thoughts

Thailand’s rainy season doesn’t have to mean getting sick—especially if you know what to look out for. Stay alert, stay dry, and enjoy the beauty of monsoon season in Phuket while staying healthy in 2025.

The post 5 Common Illnesses During the Rainy Season in Thailand (2025 Update) appeared first on Doctor Karon Clinic.

1. Dengue

Dengue is transmitted through the bite of an Aedes mosquito and is common ni tropical countries like the Philippines. Dengue fever mainly affects children and is potentially fatal.

How to prevent Dengue:

• Clean gutters so that rainwater will not turn into a breeding place of mosquitoes.
• Clean out all water containers once a week, including flower vases, pots, and drums.
• Throw away unused bottles, jars and other items that can hold water.

2. Influenza

Commonly known as the flu, influenza is a viral infection that attacks the respiratory system. It is transmitted through contact with an infected person, like when they sneeze or cough.

How to prevent influenza:

• Get your annual flu vaccine
• Avoid crowded places.
• Minimize contact with infected persons
• Cover mouth and nose when coughing or sneezing
• Wash hands frequently

3. Leptospirosis

Leptospirosis is a bacterial infection that is transmitted when urine or feces of infected animals such as rats contaminated the soil, water and vegetation. A person may get leptospirosis when open wounds, broken skin, or when eyes, nose, mouth and sinuses, come in contact with contaminated water.

How to prevent leptospirosis:

• Avoid wading in flood water.
• Drain water that may be contaminated.
• Keep your surroundings clean.
• Control any rodents in the household with rat poison or traps.

4. Hepatitis A

It is a virus that is usually transferred through the ingestion of food contaminated with urine or human waste of those already infected with Hepatitis A.

How to prevent Hepatitis A

• Wash hands thoroughly after using the toilet, before preparing food, and before meals.
• Make sure to cook shellfish like crabs and clams thoroughly.
• Practice safe handling and storage of food and water.

To strengthen your body’s immunity against rainy day diseases, take Conzace, a daily multivitamin. Conzace contains vitamins and minerals that activates more immunity cells, helping to fight germs and viruses.  

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Source : Unilab

The post 4 Rainy Day Illnesses to Watch Out For appeared first on Doctor Karon Clinic.