What Causes Palmar Hyperhidrosis?

Palmar hyperhidrosis—also known as “excessive hand sweating”—is a very common functional, localized form of hyperhidrosis caused by autonomic nervous system dysfunction. It is particularly triggered by emotional stressors such as anxiety or nervousness, leading to noticeable sweating on the palms. So, what causes palmar sweating? Below is an overview.

Causes of Palmar Sweating

1. Sympathetic Nervous System Hyperactivity

Palmar sweating can result from overactivation of the sympathetic nervous system. When autonomic nervous system imbalance occurs—especially under conditions of mental tension or anxiety—the sympathetic nervous system becomes hyperactive, triggering excessive palm sweating. If palmar sweating is solely attributable to sympathetic hyperactivity, stabilizing one’s emotional state may significantly alleviate this symptom.

2. Palmar Hyperhidrosis

Primary palmar hyperhidrosis may also cause excessive palm sweating—even in the absence of anxiety or stress. Patients with this condition often experience severe, persistent sweating of the hands. Under medical supervision, topical antiperspirants or other pharmacologic treatments may help manage symptoms; however, strict adherence to physician instructions is essential.

3. Deficiency of Qi and Blood

Deficiency of qi and blood can likewise lead to palmar sweating. This deficiency weakens the body overall, manifesting not only as excessive palm sweating but also as cold hands and feet. Patients with weakened liver or kidney function may similarly present with palmar sweating, accompanied by fatigue, generalized aching, dry mouth, and thirst.

4. Other Medical Conditions

Certain systemic diseases may also cause palmar sweating. For instance, diabetes mellitus—characterized by heightened metabolic activity—can trigger excessive palm sweating. Similarly, hypertension and hyperthyroidism are associated with this symptom. Persistent or unexplained palmar sweating warrants prompt medical evaluation.

In summary, palmar sweating may stem from sympathetic nervous system hyperactivity—particularly during emotional stress—as well as primary palmar hyperhidrosis, qi and blood deficiency, or underlying conditions such as diabetes, hypertension, or hyperthyroidism. We hope this information proves helpful.