Can Hyperhidrosis Cause Dehydration?
Generally speaking, the answer is no. There is no change in kidney function, blood concentration, or electrolyte imbalances. The body has strange ways of dealing with excessive sweating. In our own experience over the years, seeing thousands of people suffering from hyperhidrosis, we did not see any cases that had renal (kidney) function problems or anything related to dehydration.
Another common question relating to this is the relationship between hormonal problems and hyperhidrosis. In the aging population, especially among women, there are a lot of complaints about excessive facial/hair sweating that occurs.
This is especially true after menopause. We know that menopause carries with it some hormonal changes which can cause this specific type of sweating but the exact cause is unknown as of yet. Also, the treatment for this type of sweating in the elderly population is not a surgical one.