The US Centers for Disease Control and Prevention says head-injury symptoms may appear immediately or hours to days later. Older adults can also develop chronic subdural bleeding after minor injuries, making a baseline record and follow-up changes important.
The World Health Organization advises moving to the coolest room at night and using air conditioning with a fan when available during a heatwave. Fans, bathing and bedding serve different purposes, and no single bedroom temperature suits every sleeper or climate.
The IFRC's 2025 guidelines advise clean running water for at least 10 minutes and ideally 20 after a thermal burn. Large, deep, facial, airway, genital, chemical and electrical burns need urgent medical care.
The International Federation of Red Cross and Red Crescent Societies says suspected hypothermia requires immediate access to emergency medical care. First aid should stop further cooling, replace wet clothes and warm the person gradually while monitoring breathing and responsiveness.
England's National Health Service advises stretching and massaging a cramped calf, or standing on the affected leg when it is safe to do so. One-sided swelling or pain, chest pain, breathing difficulty or fainting require medical attention rather than further home treatment.
The International Federation of Red Cross and Red Crescent Societies advised a forward lean and 10 to 15 minutes of pressure in its 2025 guidelines. Persistent bleeding, lightheadedness, breathing difficulty or bleeding after a head injury needs medical attention.
The IFRC's 2025 guidelines tell bystanders to encourage an effective cough before using back blows and thrusts for choking. Infants need chest rather than abdominal thrusts, while anyone who becomes unresponsive needs CPR and emergency help.
The World Health Organization classifies heatstroke as a potentially fatal medical emergency that requires immediate medical help and rapid cooling. Cold-water immersion is the fastest field method when it can be done safely, while wetting the skin and fanning are alternatives.
Australian and English public health guidance advises gentle rinsing for loose surface debris but urgent care for chemicals, penetrating objects and high-speed injuries. A contact lens that cannot be removed safely needs professional help rather than repeated pulling.
The IFRC's 2025 guidelines say superficial cuts and grazes should be rinsed with clean running water, then covered. Heavy bleeding, retained debris, deep wounds or infection signs require medical assessment.
The American Academy of Dermatology says sunburn care starts by leaving the sun, cooling the skin and drinking extra water. Blistering, whole-body symptoms or any severe sunburn in a baby requires medical assessment.
