Hot flashes during menopause are sudden waves of heat that often spread through the chest, neck, and face. They may cause sweating, flushed skin, and a rapid heartbeat, and are often followed by a cooling or chilly feeling afterward. These episodes are among the most common symptoms of menopause and can happen during the day or night, sometimes disrupting sleep. Although they vary in intensity and frequency, they are generally linked to hormonal changes as the body adjusts during menopause.