Sweating at night but feeling cold, known as a cold sweat or nocturnal hyperhidrosis, can have various causes ranging from environmental factors to medical conditions. Common reasons include hormonal fluctuations (such as during menopause or stress), infections like colds or flu, low blood sugar, anxiety or stress triggering the body's fight-or-flight response, and underlying health issues including heart problems or shock. The body responds by sweating to cool down but simultaneously reduces blood flow to the skin causing a cold, clammy feeling. Adjusting bedroom temperature, managing stress, and addressing any underlying medical causes are typical ways to reduce these symptoms. If cold sweats are frequent or severe, medical evaluation is recommended to rule out serious conditions.
