Diarrhea causes weakness: First, it is mostly considered to be due to diarrhea complicated by dehydration and electrolyte disorders. Secondly, diarrhea accompanied by fever may also cause weakness and limb weakness. It is recommended to go to the hospital immediately and cooperate with the doctor to check the blood routine, blood biochemistry, C-reactive protein, stool routine, occult blood test, rotavirus and electrocardiogram to help understand the specific situation of intestinal infection, the severity of electrolyte disorders and the degree of dehydration. In addition, blood pressure and vital signs should be taken to detect hypotension and fever, and then treatment with fluids should be given according to the specific condition, usually to correct electrolyte disturbances, such as potassium, calcium, sodium and chloride supplementation. If bacterial infection is present, the diarrhea should be treated with a combination of antibiotics, which should be evaluated by the treating physician before use.