Diarrhea is the diarrhea, every afternoon diarrhea, usually caused by infectious or non-infectious factors. 1. Infectious factors: such as salmonella, shigella, viruses, parasites, fungal infections, gastrointestinal can cause gastrointestinal peristalsis to accelerate the symptoms of diarrhea in the afternoon. 2. Non-infectious factors: for example, eating certain drugs caused by the side effects of drugs, can cause diarrhea in the afternoon, other causes are multiple polyps in the colon, intestinal malignant tumors, ischemic enteritis, radiation enteritis, chronic pancreatitis, pancreatic cancer, chronic liver disease, hyperthyroidism, etc., which may cause diarrhea every afternoon. There may be many other causes of diarrhea every afternoon, it is necessary to actively seek medical attention, do not self-medication, should be under the guidance of the physician in accordance with the normative treatment.