When a person sweats, fluid is produced and released from the inside of the body. Sweating occurs when the sweat glands (glands that produce sweat) in different parts of your body work together to release fluid into your blood stream.
The amount of fluid that you produce depends on many factors including: how much exercise you do; how hot or cold it is outside; what time of day it is; and whether there are other medical problems with your body such as an infection. It takes about 30 minutes for most people to start sweating after starting activity – walking or running – but some might not start sweating until they’ve been doing it for a while like at least 20 minutes.
How can I tell if I’m really sweaty?