What should you know about hangover fever?

Alcohol can widen blood vessels and disturb sleep, hydration, and temperature regulation, so flushing or sweating may occur without a true fever. Check your temperature with a reliable thermometer and consider other symptoms. Fever commonly presents with an infection such as a common cold, COVID-19, or acute bronchitis; a rash, painful skin area, or breathing symptoms can change the level of concern. Alcohol itself should not be used as the explanation when symptoms are worsening.

Rest in a comfortable room, sip fluids, and wear light clothing. Eat small meals if nausea allows. Avoid more alcohol and avoid combining medicines without checking the label or asking a pharmacist, particularly if you have liver disease or take regular medicines. Note the temperature, time, new symptoms, and recent exposure to illness. Do not give aspirin to a child or teenager with a fever. A clinician can assess whether a viral illness such as bronchiolitis or croup is relevant in a child.

Get urgent help for difficulty breathing, chest pain, fainting, severe confusion, a stiff neck, a seizure, a rapidly spreading rash, or inability to keep fluids down. Seek prompt medical advice for a persistent measured fever, worsening weakness, severe headache, or fever in a very young child. If fever follows travel or animal exposure, mention this because uncommon infections such as brucellosis require specific evaluation.

Ask whether your temperature and symptoms fit an infection, dehydration, or another cause; which tests might help; and which fever medicines are safe with your health conditions, alcohol use, and current medicines.