BANGKOK, THAILAND – Thailand’s hottest season pushed the heat index to a dangerous 60 degrees Celsius in early April 2026, turning routine outings into a medical risk for older people.
Meteorologists reported that from late February to mid‑May the country’s hot season was hotter than ever recorded, with the combined effect of heat and humidity driving the so‑called heat index as high as 52 to 60 degrees Celsius in some areas. For many seniors, that level of heat was not just uncomfortable, but a serious threat to their health.
Health experts stressed that anyone who understood what happened inside the body, how a heatstroke developed and what to do in an emergency could protect themselves effectively. The guidance also detailed how to access medical assistance quickly across Thailand.
Why older people were especially vulnerable to extreme heat
The human body cooled itself through sweat, but this only worked if sweat could evaporate from the skin. In Thailand’s persistently high humidity, that evaporation was often impaired, the cooling mechanism failed and core body temperature rose. The heart then had to pump more blood through skin vessels to release heat, creating chronic strain for an older organism.
From around the age of 65, the body’s temperature regulation measurably declined. Sweat glands worked more slowly, the feeling of thirst was dampened and chronic conditions such as high blood pressure or diabetes further increased the risk. Certain medications – including diuretics, beta blockers and antihistamines – worsened the situation by impairing temperature control or speeding up fluid loss.
People taking these medicines and travelling to or living in Thailand were advised to plan for the heat with their doctor in advance. Adjusting daily routines and reviewing prescriptions before a long stay in the tropics could reduce the likelihood of heat‑related emergencies.
Heat exhaustion, heatstroke and sunstroke: three distinct conditions
The terms heat exhaustion, heatstroke and sunstroke were often mixed up, yet the differences were crucial for the right response. Heat exhaustion was described as a preliminary stage: fatigue, headaches, dizziness, nausea and pale, moist skin showed the body was still fighting but already losing ground. Immediate cooling and fluids at this point could halt the progression.
Heatstroke, by contrast, was a medical emergency. Body temperature rose above 40 degrees Celsius, the skin felt hot and often dry, and the person might appear confused, slur their speech or lose consciousness. The dangerous aspect was that those suffering heatstroke frequently stopped sweating, removing a natural warning sign.
Without rapid treatment, heatstroke risked lasting damage to the brain, kidneys and heart. Sunstroke mainly affected the head, causing redness, headaches and nausea without the same systemic overheating, and could appear hours after sun exposure.
Warning signs that should not be ignored
Heatstroke usually announced itself through early symptoms that observers could spot. Persistent dizziness, severe exhaustion despite resting, a pulse clearly faster than usual and headaches that did not improve were all key warnings. Unusually dark urine also indicated that the body lacked sufficient fluid.
If exhaustion tipped into an emergency, confusion, slowed or incoherent speech, convulsions and loss of consciousness could follow. In a classic heatstroke, the skin might be dry and reddened despite extreme temperatures, precisely when sweating had stopped. Every minute without active cooling increased the risk of permanent damage.
Immediate steps when heatstroke was suspected
The first measure was to move the affected person out of direct sun into shade, an air‑conditioned building or at least under a fan. Tight clothing should be loosened and the person laid flat. Active cooling with wet, cool cloths on the neck, armpits, elbows and groin was recommended, as these areas released heat particularly efficiently.
Anyone who was conscious and able to swallow should receive water or electrolyte solutions, but no alcohol or sugary soft drinks. If a person was unconscious or not responding clearly, they needed to be placed in the recovery position and the emergency number dialled immediately.
Thailand’s nationwide emergency medical number was 1669, connecting callers to the medical rescue service. Tourists requiring English support could contact the multilingual tourist police on 1155, while many private hospitals, such as Bangkok Hospital Pattaya on 1719, operated their own direct hotlines.
Risk periods and official heat warnings in Thailand
The Department of Disease Control (DDC) recorded 21 heat‑related deaths for 2025, with 67 percent of victims outdoors at the time. April was the most dangerous month, accounting for more than half of the fatalities. People aged 60 and over were among the most affected groups, along with those with pre‑existing conditions like high blood pressure or diabetes.
Authorities advised residents and visitors to avoid strenuous outdoor activity between 11 a.m. and 3 p.m. In Bangkok, more than 300 air‑conditioned spaces had been set up in government buildings, health centres and schools as public cooling points.
The free LifeDee app for iOS and Android displayed the current heat index using colour codes and mapped nearby health facilities. Officials recommended checking the app before leaving home or a hotel to plan safer routes and times.
Medications, alcohol and other hidden risk factors
Alcohol emerged as an underestimated hazard in extreme heat. It dilated blood vessels, intensified fluid loss and dulled awareness of early warning signs. The DDC named alcohol explicitly as a major risk factor in heat‑related deaths.
Afternoon beer in direct sun therefore significantly weakened the body’s protective reactions. Caffeine and highly sugary drinks also accelerated dehydration, adding to overall strain during hot, humid days.
People on regular medication – especially diuretics, antidepressants, certain blood pressure drugs or anti‑allergy medicines – were urged to discuss potential adjustments with their treating physician before travelling or relocating to Thailand. Self‑directed changes to prescriptions were described as dangerous and should only occur under medical supervision.
Practical protection: what actually helped
Older adults often sensed thirst too late, when dehydration was already developing. The general recommendation was to drink two to three litres of water a day, even without feeling thirsty. Electrolyte solutions from pharmacies or convenience stores, which were widely available across Thailand, helped replace minerals lost through sweat.
Morning urine that appeared dark should be treated as an alarm signal to increase fluid intake immediately. The goal was pale yellow to clear urine. A large water container from a supermarket cost around 55 baht, offering inexpensive but reliable protection.
Light, loose, breathable fabrics such as linen or modern functional fibres allowed heat to escape, while dark colours and many synthetic materials trapped it. A wide‑brimmed hat or simple umbrella shielded the head and neck, which were particularly stressed by direct radiation. Many Asian residents consistently covered up in this way, a practice that sometimes seemed overdressed to European visitors but was medically sound.
Daily plans were best aligned with the reported heat index. Errands, walks and excursions were safest in the early morning or late evening hours, while the period between 11 a.m. and 3 p.m. should be spent in cool environments such as shopping centres, hotels, temple halls or air‑conditioned cafés. This behaviour was framed not as luxury, but as common sense.
A parked car in the sun could heat up to more than 50 degrees Celsius within 20 to 30 minutes, posing a life‑threatening situation for anyone inside and especially for older people or those with heart problems. Those waiting for someone were advised either to keep the air conditioning running or leave the vehicle and seek shade.
Medical care in Thailand: key facts for visitors
In the major tourism and expatriate hubs of Bangkok, Pattaya, Phuket and Chiang Mai, private hospitals offered services at an international standard. Facilities such as Bumrungrad, Samitivej and Bangkok Hospital were accredited by the Joint Commission International, the globally recognised quality benchmark.
Emergency departments in these hospitals employed English‑speaking staff, and some also had German‑speaking personnel. However, Thailand’s hospitals generally required full payment at the latest upon discharge, which could create problems for uninsured travellers.
Without health insurance, even outpatient emergency care could cost several tens of thousands of baht. A 24‑hour stay in hospital could quickly reach 40,000 to 50,000 baht or more, and in the worst case had to be paid in advance. Travellers were therefore urged to carry a credit card with sufficient limit at all times.
Acclimatisation: why the body needed time
New arrivals from colder countries often underestimated the effort the body needed to adjust to permanently tropical conditions. Medically, this process was called acclimatisation and typically took around two weeks for young adults, but significantly longer for people over 65. During this adjustment phase, tolerance to physical strain was noticeably reduced.
Someone aged 67 visiting Phuket for several weeks for the first time and planning long excursions on the second day faced a much higher risk than they would a year later. The recommendation was to halve the pace in the first days, limit activities to mornings and evenings and allow the body time to adapt.
This approach was presented not as excessive caution but as prudent planning, especially for older travellers or those with chronic illness. Respecting the limits of an unacclimatised body could prevent serious heat‑related incidents.
Concrete steps for safer travel and daily life
Key emergency numbers were to be stored in the phone before leaving a hotel: 1669 for the medical rescue service and 1155 for the tourist police. Travellers were advised to download the free LifeDee app and check the heat index before every outing.
Carrying a credit card with a high enough limit was considered essential in case of sudden hospital admission. Those without travel or international health insurance were urged to arrange coverage before their next stay in Thailand to avoid financial shocks.
The country itself was not portrayed as a dangerous destination, but as one that demanded respect for its climate. Anyone who approached the hot season sensibly, stayed cool during midday hours, drank enough and recognised bodily warning signs could live and travel safely, even in April.
Editorial guidance underlined that the information provided did not replace medical advice. People with pre‑existing conditions – especially cardiovascular disease, diabetes or kidney disorders – were encouraged to consult a doctor before longer stays to discuss medication and daily planning.
“In an emergency, call Thailand’s 1669 medical hotline immediately and do not wait.”
said the article’s editorial note.