There is no single answer to the question of what causes sudation. Many different factors can contribute, including humidity, exercise, and heat. When the body first starts to sweat, it releases salt water. The water and salt mixture accumulates on the skin's surface and makes it feel wet. Sweat evaporates very quickly and leaves the skin feeling dry.

Sudation can be a warning sign that something is wrong. It can be a sign of a mental health condition called hypothyroidism, which is when the body doesn't produce enough thyroid hormone.