Anhidrosis or hypohydrosis is a dysfunction in which a person is unable to sweat when they are hot. Anhidrosis refers to the complete absence of sweating, while hypohidrosis is when a person sweats less than normal.

Sweating allows heat to be released from the body. If people cannot sweat properly, they cannot cool themselves, and this can be harmful.

If the condition affects a small area of the body, it is not usually dangerous, but anhidrosis or hypohidrosis of the entire body can result in overheating and eventually heatstroke, a potentially life-threatening condition. A person may not realize they have the condition until it is serious.

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