In hot weather or working in a hot environment, symptoms such as weakness of the limbs and more sweating are likely to occur. The main causes of general weakness are the following: 1. Heat stroke, which can be classified as mild, moderate and heat exhaustion, etc. Common clinical symptoms include headache, high fever, weakness, etc. Severe patients can develop heat exhaustion, water-electrolyte disorders, dehydration and other symptoms, and life-threatening, it is recommended to drink more water and try to rest in a cool place. 2. Insufficient blood supply to the cerebral arteries, the whole body vasodilates in hot weather, resulting in reduced blood flow back to the cerebral arteries, resulting in symptoms of insufficient blood supply to the cerebral arteries, dizziness, general weakness and other discomforts. 3. Usually drink more water, avoid resting in a hot environment, and drink light salt water when sweating more to avoid hypokalemia.