Heat stroke patients gastrocnemius muscle spasm is usually people often say calf cramps, heat stroke will appear a lot of sweating, salt loss, while many people only replenish water, but do not pay attention to replenish electrolytes, causing the body salt deficiency, resulting in serious sodium deficiency. Sodium ion is the main positively charged ion in the extracellular fluid, maintaining water-electrolyte balance, and water-electrolyte balance can maintain normal muscle contraction, while sodium ion can also maintain the body’s acid-base balance, the body’s severe sodium deficiency will cause the gastrocnemius muscle, that is, the calf muscle can not carry out normal contraction, there is a continuous spasm, resulting in calf cramps, pain, and even pain can not walk. At this time, patients can supplement the appropriate amount of light salt water, juice to relieve the gastrocnemius muscle spasm, that is, calf cramps symptoms. At the same time, patients should not put themselves in a hot environment or hot and humid environment for a long time again in daily life to avoid heavy sweating and excessive loss of sodium, which can cause calf cramps to occur.