Hot water epilepsy: understanding heat-triggered seizures

Some people have seizures during or soon after hot water is poured over the head or body. The seizure may involve staring, reduced awareness, stiffening, jerking, unusual movements, or a brief period of confusion afterward. A hot-water trigger does not by itself confirm epilepsy; fainting, overheating, and other events can look similar. A witness account or video, when safely obtained, can help a clinician understand the episode.

The risk is greatest when a person is alone near deep water, slippery surfaces, or an unlocked bathroom door. Scalds and drowning are preventable hazards even when the seizure itself ends quickly.

Use comfortably warm rather than very hot water, and test it before bathing. Prefer a shower with someone nearby who knows what to do, keep the door unlocked, and use non-slip supports. Avoid pouring hot water over the head until a clinician has advised you. Follow prescribed seizure treatment exactly and keep a record of triggers, duration, awareness, movements, and recovery. During a seizure, move nearby hazards away, cushion the head, do not restrain the person, and never put anything in their mouth.

Call emergency services if a seizure lasts longer than expected, repeats without full recovery, causes breathing difficulty or a serious injury, happens in water, or is a first suspected seizure. Place the person on their side after the movements stop if breathing normally, and stay with them while help arrives. A first episode needs prompt medical review even when recovery seems complete.

Ask whether the episode needs neurological testing, whether a particular temperature or bathing routine should be avoided, and how to create a seizure first-aid plan. Ask when it is safe to bathe independently and how medicines should be managed.