What causes night sweats?

Sweating is a physiological function through which the human body eliminates waste and regulates body temperature. However, if the pattern of sweating—such as the amount, color, or odor of sweat—changes significantly, it may serve as an early warning sign of certain diseases and warrants attention. In daily life, many people experience night sweats while sleeping. So, what causes night sweats? The following section addresses this question.

What Causes Night Sweats?

1. Sleep Environment

Excessively high indoor temperatures are one common cause of night sweats, as are heavy, non-breathable blankets. Additionally, emotional irritability or psychological stress may also trigger night sweats. These are environmental factors; therefore, individuals should aim to maintain appropriate temperature and humidity levels in their sleeping environment.

2. Underlying Medical Conditions

Night sweats frequently occur in association with endocrine disorders, such as hypertension, diabetes, endocarditis, tuberculosis, and hyperthyroidism. These conditions stimulate the nervous system, leading to neural dysregulation and resulting in deficiency of yin blood—a traditional Chinese medicine (TCM) concept—which in turn triggers night sweats.

3. Yin Deficiency and Qi Deficiency

From a TCM perspective, excessive sweating primarily stems from either qi deficiency or yin deficiency. If caused by qi deficiency, impaired vasodilation and cardiac insufficiency may lead to palpitations and insomnia; treatment should focus on nourishing the blood. If caused by yin deficiency, symptoms such as restlessness, dry mouth and throat, and night sweats may appear; management should emphasize nourishing yin and clearing internal heat.

4. Hyperhidrosis

Hyperhidrosis is characterized by excessive sweating even in the absence of anxiety or tension. It is classified into localized and generalized forms. Individuals with hyperhidrosis tend to sweat more than others when exposed to heat or emotional stimuli. If excessive sweating occurs year-round, hyperhidrosis is likely present. Patients should strictly follow their physician’s prescribed treatment plan.

The above outlines potential causes of night sweats. We hope this information is helpful to you.