If a patient has diarrhea and weakness, it can be considered to be caused by the following reasons: First, it can be considered to be caused by cold, abnormal blood pressure and other conditions, which can lead to diarrhea and weakness, you can check your blood pressure and body temperature, or even go for a routine blood test. Second, can be considered due to gastrointestinal flu, caused by diarrhea, weakness symptoms, this time should pay more attention to rest, pay attention to the diet light. Thirdly, it can be considered that diarrhea is caused by dehydration and electrolyte disorders, resulting in diarrhea and weakness. If the patient has diarrhea accompanied by fever, it is recommended that the patient immediately go to the hospital for routine blood tests, blood biochemistry, stool routine and electrocardiogram, etc., to identify the specific cause. All of the above causes can make the patient suffer from diarrhea and weakness.