Symptoms after heat stroke: recovery and warning signs

Heat stroke is a medical emergency that can affect the brain, kidneys, liver and muscles. Even after body temperature is controlled, fatigue, poor concentration, weakness, headache, dizziness, nausea and reduced appetite may linger while the body recovers. Symptoms should gradually settle rather than become more intense. Fever or vomiting after treatment deserves medical advice because it may reflect ongoing heat illness, dehydration or another problem.

Recovery varies with the severity of the episode, the organs affected and the treatment received. A clinician may arrange blood or urine tests and follow-up when there was organ strain, prolonged confusion or hospital treatment.

Follow the discharge plan, rest in a cool environment and drink fluids as advised. Avoid strenuous exercise, hot workplaces, saunas and long periods outdoors until a clinician says return is appropriate. Resume activity gradually; stopping if dizziness, nausea, unusual weakness or headache returns helps prevent another heat exposure. Do not rely on fever-reducing medicine to treat overheating, because heat stroke is not caused by the body's usual fever response.

Keep any recommended follow-up appointment and bring a list of medicines and supplements. Some medicines can affect hydration, sweating or heat tolerance, but prescriptions should not be stopped without clinical advice.

Call emergency services for confusion, unusual behaviour, collapse, a seizure, severe breathing difficulty, inability to wake normally, or hot skin with worsening illness. Move the person to shade or air conditioning and begin active cooling while help is coming. Do not force drinks if the person is confused, vomiting repeatedly or not fully alert.

Contact a clinician promptly for reduced urination, very dark urine, worsening muscle pain, persistent vomiting, yellowing of the eyes or skin, chest pain, or symptoms that improve and then return. These signs need assessment rather than home observation alone.

Ask whether you need tests for kidney, liver or muscle injury; when you can safely return to exercise or outdoor work; how much fluid is suitable for you; and whether any medicine changes your heat tolerance. Also clarify which symptoms should trigger a same-day review and whether another follow-up visit is needed.