Three consecutive days of diarrhea, need to first consider the possibility of acute gastroenteritis, in addition, there may be allergic factors, mental factors and other diseases induced. 1. Acute gastroenteritis: the more common clinical symptom is diarrhea, which may be related to eating food contaminated by pathogenic bacteria or toxins that cause acute inflammatory changes in the gastrointestinal mucosa. 2. Allergic factors: patients exposed to allergenic substances, or patients belonging to the allergic body, such as lactose intolerance, etc., may also cause continuous diarrhea. 3. Mental factors: excessive tension and other mental factors can lead to a surge in adrenaline and thyroxine and other hormones, causing hypersecretion of glandular tissues, leading to increased frequency of gastrointestinal peristalsis, triggering digestive disorders, and continuous diarrhea symptoms may occur. 4. Other diseases: such as intestinal tuberculosis, intestinal polyps and intestinal tumors, etc., can also lead to gastrointestinal dysfunction, which in turn induces the appearance of continuous diarrhea. It is recommended that patients need to go to regular hospitals to receive relevant examinations and actively seek treatment to avoid affecting their health.