People with hyperhidrosis have overactive sweat glands.
Sweating can occur when the temperature is cool in people with hyperhidrosis.
Primary hyperhidrosis involves sweating on the face and scalp.
Primary hyperhidrosis affects 10 percent of the population.
One diagnostic test includes applying a special paper to a problem area, then weighing the amount of sweat.
Strong antiperspirants, medications, Botox and minimally invasive surgical procedures can be used to treat hyperhidrosis.