Why do I sweat this much an..

For my personal style, I straighten my hair. But it's hard to keep it perfect because I sweat a lot! And I'm not overweight, actually I'm underweight and it's so annoying when I have to walk a normal lenght distance with my friends and I end up completely sweaty... I've tried strong desodorants, small clothes and pony tails to avoid heat but I still can't get rid of this problem. Help please.

You have between 2 million and 5 million eccrine sweat glands. When your body temperature rises, your autonomic nervous system stimulates these glands to secrete fluid onto the surface of your skin, where it cools your body as it evaporates. This fluid (perspiration) is composed mainly of water and salt (sodium chloride) and contains trace amounts of other electrolytes 鈥?substances that help regulate the balance of fluids in your body 鈥?as well as substances such as urea.

Apocrine glands, on the other hand, secrete a fatty sweat directly into the tubule of the gland. When you're under emotional stress, the wall of the tubule contracts and the sweat is pushed to the surface of your skin where bacteria begin breaking it down. Most often, it's the bacterial breakdown of apocrine sweat that causes an odor.

A number of factors can affect how much you sweat as well as your sweat's smell. Certain foods, drugs or medical conditions can cause excessive sweating, whereas drugs or conditions may interfere with your ability to perspire normally.