Tests and diagnosis

By Mayo Clinic Staff

During your appointment, your doctor will ask about your medical history and conduct a physical exam. If your symptoms are obvious, it may be relatively easy for your doctor to diagnose hyperhidrosis.

Lab tests

Your doctor may order blood or urine tests to determine if the excessive sweating is caused by another medical condition, such as an overactive thyroid (hyperthyroidism) or low blood sugar (hypoglycemia).

Thermoregulatory sweat test

During this test, your skin is coated with a powder that changes color when it gets wet. The test begins in a room heated to a comfortable temperature, and then you enter a heating cabinet that brings your core temperature up to 100.4 F (38 C). Most people who have hyperhidrosis sweat enough to make the powder turn purple before they go into the heating cabinet.

Sept. 21, 2012