There can be many potential causes of hyperhidrosis, but the primary cause is related to nerve signals. These faulty signals can cause the sweat glands to go on overdrive, producing excess sweat.
Hyperhidrosis is commonly attributed to genetics, with the problem running in the family. However, there are also other conditions that can lead to hyperhidrosis. These include rapid hormonal changes like those that occur during pregnancy or menopause. Anxiety can also be a cause, as can certain types of medication.