Sri Lanka operates a dual health system comprising government hospitals offering free services and private facilities charging international rates. The government sector includes teaching hospitals in Colombo, Kandy, Galle, and Jaffna that handle complex cases, while district hospitals serve secondary care and peripheral units address primary needs. The National Hospital of Sri Lanka in Colombo functions as the primary referral center with approximately 3,300 beds. Private hospitals such as Nawaloka Hospital, Asiri Hospital Group, and Lanka Hospitals in Colombo provide services comparable to regional standards with English-speaking staff. Outside major cities, medical infrastructure declines substantially. Rural areas rely on government dispensaries with limited diagnostic equipment. The Central Highlands including Nuwara Eliya and remote sections of the Dry Zone have minimal emergency response capacity. Ambulance services in rural districts lack advanced life support equipment. Travelers requiring dialysis, chemotherapy continuation, or complex chronic disease management should verify facility capability before departure.
Dengue fever occurs year-round across Sri Lanka with peaks following monsoon periods. The Wet Zone including Colombo, Galle, and Kandy reports higher case concentrations than the Dry Zone. The 2017 outbreak recorded approximately 186,000 cases. No vaccine exists. Prevention relies entirely on mosquito avoidance during daytime hours when Aedes aegypti feeds. Mosquito repellent containing DEET, picaridin, or IR3535 applied to exposed skin reduces bites. Long sleeves and trousers treated with permethrin provide additional protection. Air-conditioned accommodations reduce exposure. Standing water in plant saucers, blocked gutters, and discarded containers breeds vectors. Symptoms appear four to seven days post-infection. High fever, severe headache, pain behind eyes, joint pain, and rash characterize classic presentation. Warning signs include persistent vomiting, abdominal pain, bleeding gums, or lethargy. These indicate potential progression to severe dengue requiring immediate hospital admission for intravenous fluids and monitoring.
Chikungunya follows similar geographic and seasonal patterns to dengue. The same Aedes mosquitoes transmit both viruses. Outbreaks occurred in Colombo, Gampaha, and Kalutara districts during 2017. Joint pain from chikungunya can persist for months. No specific treatment exists beyond symptom management. Japanese encephalitis risk remains low but present in agricultural areas of the Dry Zone where rice paddies and pig farming coincide. Anuradhapura, Polonnaruwa, and districts surrounding Trincomalee report sporadic cases. The vaccine requires two doses separated by 28 days. Completion before travel is necessary for protection. Malaria elimination was certified by WHO in 2016. No prophylaxis is required. Leptospirosis occurs during monsoon flooding when contact with contaminated water introduces the bacteria. Rice farmers, sewage workers, and travelers wading through floodwater face exposure. The Wet Zone reports higher incidence. Symptoms include high fever, headache, muscle pain, and jaundice. Doxycycline administered early shortens illness duration. Rabies remains endemic. Stray dogs populate urban areas including Colombo, Galle, and Kandy. Monkeys at Dambulla Cave Temple, Sigiriya, and Sacred Tooth Relic temple grounds bite when humans carry food. Any bite or scratch breaking skin requires immediate wound washing with soap and water for 15 minutes followed by clinic presentation. Post-exposure prophylaxis consists of four doses of vaccine over 14 days. Rabies immunoglobulin is often unavailable outside Colombo. Pre-exposure vaccination with three doses simplifies post-bite management and is recommended for travelers visiting rural areas or handling animals.
Routine vaccinations should be current. Measles cases increased regionally during 2019. Two doses of MMR provide protection. Tetanus boosters are necessary every ten years. The final polio dose for adult travelers who completed childhood series is recommended if traveling to areas with sanitation deficiencies. Hepatitis A transmits through contaminated food and water. The vaccine requires one dose with a booster at 6 to 12 months for long-term immunity. Short-term travelers gain protection from the initial dose. Hepatitis B spreads through blood and bodily fluids. The vaccine consists of three doses at zero, one, and six months. Travelers anticipating medical procedures, tattoos, or extended stays should complete the series. Typhoid occurs in areas with inadequate sanitation. Injectable Vi polysaccharide vaccine or oral Ty21a vaccine both provide partial protection. Handwashing before eating and selective food choices reduce risk more effectively than vaccination alone.
Water quality varies significantly. Colombo municipal supply undergoes treatment but aging pipes introduce contamination. Hotels and guesthouses often provide filtered or boiled water. Outside urban centers, well water and surface sources lack reliable treatment. Bottled water is widely available. Brands including Aqua Fresh, Casons, and Highland produce in-country under regulatory oversight. Check seals before purchase. Avoid ice unless made from purified water. Street vendors use tap water for washing fruit and preparing beverages. Fresh produce should be washed in bottled or boiled water then peeled when possible. Hot food served immediately after cooking carries lower risk than buffet items sitting at room temperature. Rice and curry meals prepared to order in small restaurants generally prove safer than elaborate hotel buffets. Coconut water directly from king coconuts sold by roadside vendors is sterile if opened in front of the buyer. Thambili stalls are common along southern coastal roads and in Colombo. Dairy products including curd served with kiri hodhi and watalappan use boiled milk. Unpasteurized milk products exist in rural markets but are uncommon in tourist areas.
Heat illness affects travelers underestimating tropical conditions. Coastal areas including Galle, Trincomalee, and Jaffna experience high humidity year-round. The Dry Zone reaches 35 degrees Celsius during March and April. Exertion during midday hours without adequate water intake causes heat exhaustion. Symptoms include heavy sweating, rapid pulse, dizziness, and nausea. Moving to shade, removing excess clothing, and drinking water resolves most cases. Heat stroke presents with confusion, loss of consciousness, and body temperature above 40 degrees Celsius. This constitutes a medical emergency requiring immediate cooling and hospital transport. Acclimatization requires three to five days of reduced activity. Alcohol and caffeine increase dehydration. Electrolyte replacement becomes necessary during extended trekking such as climbing Adam's Peak or hiking through Horton Plains National Park. Oral rehydration salts available at pharmacies restore sodium and potassium lost through sweat.
Altitude sickness rarely occurs given Sri Lanka's modest elevations. Pidurutalagala reaches 2,524 meters but remains inaccessible to tourists. Nuwara Eliya sits at approximately 1,868 meters. Most travelers experience no symptoms at this altitude. Those with pre-existing heart or lung conditions should monitor for shortness of breath and headache. Gradual ascent from Colombo through Kandy to Nuwara Eliya over two days allows adaptation. No medication is required.
Fungal infections develop in hot humid conditions. Feet remain damp in closed shoes. Sandals reduce moisture accumulation but offer no protection during jungle trekking in Sinharaja Forest Reserve or Knuckles Conservation Forest. Antifungal powder applied daily to feet and groin prevents most infections. Cotton clothing dries faster than synthetic fabrics. Wet clothing should be changed promptly. Swimmer's ear occurs after repeated immersion in sea water along beaches near Hikkaduwa, Mirissa, and Arugam Bay. Drying ears thoroughly after swimming and using acetic acid drops if irritation develops prevents bacterial growth.
Cuts and scrapes become infected rapidly in tropical climates. Coral cuts sustained while snorkeling near Pigeon Island or Hikkaduwa Marine National Park require immediate cleaning. Coral contains bacteria causing persistent infections. Washing wounds with clean water and applying antibiotic ointment under waterproof dressings prevents complications. Deep cuts or wounds showing red streaks, swelling, or pus require antibiotic treatment. Leech bites occur during wet season trekking in the Central Highlands. Leeches do not transmit disease but wounds may become infected if scratched. Salt or insect repellent applied to leech attachment points causes detachment. Pulling leeches off leaves mouthparts embedded in skin.