Abnormal sweating is known as dyshydrosis, and it is thought to be caused by an inherent abnormality of the autonomic nervous system. It may be worse in some neurological disorders or when there is diabetes. Anxiety makes the problem more troublesome, and anti-anxiety medication may help. Avoiding sweating by limiting exposure to heat is not always practical. One may be able to raise the threshold of onset (and reduce unwanted sweating) by regularly working up a sweat by vigorous exercise. Some surgeons are willing to cut the responsible autonomic nerves, but there is a risk of damage to normal voluntary nerves that may be close to the site of the operative intervention.