What is a common indication that someone is experiencing heat exhaustion?

A common indication that someone is experiencing heat exhaustion is cool, clammy skin. This condition typically arises when the body overheats due to prolonged exposure to high temperatures, strenuous activity, or dehydration. In heat exhaustion, the body's mechanisms to cool down become overwhelmed, leading to symptoms like excessive sweating. The skin may feel cool and clammy as sweat evaporates, which is an attempt by the body to regulate its temperature. This contrasts with more severe heat-related illnesses, such as heat stroke, where the skin often becomes hot and dry due to the body’s failure to sweat. Thus, recognizing cool, clammy skin is crucial in identifying heat exhaustion and responding appropriately.