What Causes Palmar Hyperhidrosis?

Palmar sweating is a very common physiological phenomenon that helps the body dissipate internal heat. However, when excessive sweating significantly interferes with daily life, it is commonly referred to as palmar hyperhidrosis—a functional, localized form of excessive sweating and a relatively common condition. So, what causes sweating specifically on the palms? Below, we address this question.

What Causes Palmar Sweating?

1. Psychological Factors

In many cases, emotional changes—such as mental tension, anxiety, fear, or worry—trigger overactivity of the sympathetic nervous system, resulting in increased sweating on the palms. This is commonly described as “sweaty palms” or “clammy hands.” Typically, mild palmar sweating under such circumstances represents a normal physiological response.

2. Spleen-Stomach Deficiency

Palmar sweating caused by spleen-stomach deficiency may occur after consuming hard-to-digest or unsuitable foods, leading to symptoms including poor appetite, gastrointestinal dysfunction, and a sensation of warmth or heat in the palms. The most effective approach for relief involves taking herbal medicines that nourish the stomach and replenish qi and blood. Additionally, abdominal massage may be beneficial when appropriate.

3. Disease-Related Factors

Palmar sweating may result from hypersensitivity or dysfunction of the eccrine glands in the hands. Such cases often reflect underlying systemic disorders—for example, thyroid dysfunction or diabetes mellitus. Moreover, certain central nervous system diseases may also induce excessive hand sweating. Finally, impaired function of the sympathetic nerves responsible for regulating palmar sweat production can likewise lead to increased sweating.

4. Blood Deficiency and Yin Deficiency

Individuals experiencing palmar sweating accompanied by internal heat sensations (e.g., dry mouth, night sweats, or irritability) are typically diagnosed with blood deficiency and/or yin deficiency in Traditional Chinese Medicine (TCM). Such individuals should avoid spicy foods and minimize late-night activities. Treatment focuses primarily on nourishing yin and enriching blood, which must be guided by a qualified healthcare provider through appropriate herbal prescriptions.

The above outlines the primary causes of palmar sweating. We hope this information proves helpful to you.