Fainting is a brief loss of consciousness. Someone who faints may pass out for several seconds or up to an hour. There are many reasons people faint. Medical reasons include: Low blood sugar (hypoglycemia) which is common in early pregnancy; anemia;...
Sweat acts like our natural air conditioner. As sweat evaporates from our skin, it cools us off. Our personal cooling system can fail, though, if we overexert ourselves on hot and humid days. When this happens, our body heat can climb to dangerous...
American Institute for Preventive Medicine