Night sweat is the condition of excessive sweating during the night and distinguished from ordinary sweating due to unusually warm surroundings. Medical professionals also refer to it as hot flashes.

Night sweating can be an indication of a harmless situation or the indication of some serious ailment. The different causes of night sweating are menopause, cancer, neurological conditions, hormone disorders and infections. Some medicines are also known to be a cause of the night sweats.