Select your destinations and travel month to get a personalised dengue risk assessment. Includes prevention tips, symptom awareness, and what to do if you get sick.
Select one or more destinations to compare dengue risk.
Northern
Central
Islands
Southern
Eastern & Western
Dengue risk varies dramatically by season. Select your travel month.
July: Heavy monsoon rains. Very high mosquito populations across the country.
Urban with some drainage issues. Year-round risk in certain neighbourhoods, but generally manageable.
Season
4.5/5
Location
0.9x
Score
4.0/7.5
Reduce your dengue risk with these practical steps. Tick them off as you prepare for your trip.
Symptoms appear 4-14 days after being bitten by an infected mosquito. Know what to look for.
High fever (40C / 104F)
Sudden onset 4-14 days after being bitten. Often comes on very quickly.
Severe headache
Intense headache, particularly behind the eyes. Often described as the worst headache ever.
Muscle and joint pain
Called "breakbone fever" because the body aches can be so severe. Rest is essential.
Nausea and fatigue
General feeling of illness, loss of appetite, extreme tiredness.
Skin rash (days 2-5)
A flat, red rash may appear 2-5 days after fever onset. Can be itchy.
What to do: Rest, stay hydrated, take paracetamol (acetaminophen) for fever. Monitor symptoms closely.
Severe abdominal pain
Persistent, intense stomach pain that does not improve. See a doctor within 24 hours.
Persistent vomiting
Vomiting 3 or more times in 24 hours. Risk of dehydration. Seek medical attention.
What to do: See a doctor within 24 hours if fever persists more than 48 hours. Continue hydrating. Do NOT take aspirin or ibuprofen.
Bleeding gums or nose
Spontaneous bleeding from gums, nose, or easy bruising. This is a WARNING sign.
Blood in vomit or stool
Vomiting blood or dark/bloody stools. Go to the ER IMMEDIATELY.
Difficulty breathing
Rapid or difficult breathing, chest pain. This indicates severe dengue. Call emergency services.
Cold or clammy skin
Cold, pale, clammy skin with restlessness. Signs of dengue shock syndrome. EMERGENCY.
Extreme fatigue or restlessness
Lethargy, confusion, or extreme agitation. Indicates the body is struggling. Seek ER immediately.
What to do: Go to the nearest hospital ER IMMEDIATELY. Severe dengue can be fatal without proper medical treatment. Do not wait.
CRITICAL: Do NOT Take Aspirin or Ibuprofen
If you suspect dengue, only take paracetamol (acetaminophen) for pain and fever. Aspirin and ibuprofen (Advil, Nurofen) are blood thinners and can cause dangerous internal bleeding with dengue fever. This applies to all severity levels.
Follow this step-by-step guide if you think you might have dengue.
Sudden high fever after being in Thailand?
Especially 4-14 days after mosquito exposure. Fever above 38.5C (101F) with body aches.
Rest, hydrate, paracetamol only
Drink plenty of water, oral rehydration salts, fruit juice. Take paracetamol for fever. NO aspirin. NO ibuprofen. Rest as much as possible.
Still sick after 48 hours?
If fever persists beyond 2 days, or you are not improving, see a doctor. Any clinic or hospital can do a dengue NS1 antigen test (results in 15 minutes, costs 200-500 THB).
Warning signs? Go to ER IMMEDIATELY
Bleeding gums/nose, blood in vomit or stool, severe abdominal pain, persistent vomiting, difficulty breathing, cold/clammy skin. Do not wait — severe dengue can be fatal.
Hospital Finder
Find the nearest hospital or clinic in Thailand. Search by destination, filter by English-speaking staff.
Vaccination Checklist
Get a personalised vaccination checklist based on your itinerary, activities, and trip length.
This calculator provides risk estimates based on seasonal dengue patterns and location characteristics in Thailand. Risk levels are approximate and based on historical data — actual risk can vary year to year depending on weather patterns, outbreaks, and local conditions.
This tool is not medical advice. Always consult a travel health professional before your trip and seek medical attention immediately if you experience symptoms. Thailand has excellent hospitals — treatment is affordable and widely available.
Data sources: Thailand Ministry of Public Health dengue surveillance reports, WHO dengue situation updates, and CDC travel health guidance for Thailand.
