Merck Manual

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Some Causes of Excessive Sweating

Some Causes of Excessive Sweating

Type

Examples

Cancer*

Lymphoma, leukemia, carcinoid tumors, some tumors of the adrenal glands

Drugs

Antidepressants, aspirin and other nonsteroidal anti-inflammatory drugs (NSAIDs), some drugs for diabetes, caffeine, and theophylline

Withdrawal from opioids

Hormonal (endocrine) disorders

An overactive thyroid gland (hyperthyroidism), low blood sugar levels (hypoglycemia), diabetes that affects the nerves, and certain pituitary gland disorders or use of drugs that affect pituitary gland function

Infections*

Tuberculosis, heart infection (endocarditis), and severe fungal infections affecting the entire body

Nervous system disorders 

Injuries, dysfunction of the autonomic nervous system, and some brain disorders

Other†

Pregnancy

Anxiety, excitement, anger, or fear

Fever

Heat exposure

Sweating around the lips and mouth after eating hot, spicy foods (called gustatory sweating)

Unknown

* These types primarily cause night sweats.

† Some degree of sweating caused by these conditions can be normal.