Wilderness: Heat Cramps, Heat Exhaustion, or Heat Stroke

• Heat Cramps, Heat Exhaustion, or Heat Stroke Overview
• Heat Cramps, Heat Exhaustion, or Heat Stroke Symptoms
• Heat Cramps, Heat Exhaustion, or Heat Stroke Treatment
• When to Seek Medical Care
• For More Information
• Synonyms and Keywords
• Authors and Editors

Heat Cramps, Heat Exhaustion, or Heat Stroke Overview

Heat cramps

Heat cramps are caused by a deficiency of water and sodium in the body. Heat cramps occur in the muscles after exertion; often after a person sweats profusely and drinks water but without adequate electrolyte replacement.

Heat exhaustion

Heat exhaustion is caused by excessive fluid loss in a hot environment. Sweating occurs with heat exhaustion, and the person's temperature may be elevated but not above 104°F (40°C).

Heat stroke

Heat stroke is the most severe form of heat-related illness. Heat stroke occurs when the body's heat-regulating mechanism fails. A person's temperature may be elevated above 104°F (40°C). The skin is warm and dry. The high body temperature damages tissues, including muscle and brain tissue. Heat stroke may lead to permanent disability and death.

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