What usually causes hyperhidrosis?

Hyperhidrosis is a condition characterized by excessive sweating that isn't directly related to heat or exercise. While there are various factors that can contribute to sweating issues, a significant number of cases arise without a clear underlying cause. This is often termed "primary hyperhidrosis," which typically begins in childhood or adolescence and can affect specific areas like the hands, feet, or underarms.

In many instances, the exact triggers for excessive sweating remain unidentified, which is why the answer regarding unknown causes is considered correct. The condition can be exacerbated by emotional stress or anxiety, but the foundational etiology in many cases doesn't have a definitive medical explanation.

Other factors such as fever, skin diseases, and scratching contribute to sweating but are often secondary effects or specific scenarios rather than the primary triggers of hyperhidrosis itself. Therefore, understanding that the majority of hyperhidrosis cases have unknown causes highlights the complexity of the condition and the need for further research into its origins.