Patients with diarrhea for no apparent reason may be suffering from irritable bowel syndrome, which is a common functional intestinal disorder. Some patients are prone to irritable bowel syndrome due to long-term mental stress and long-term unreasonable eating habits. Patients are prone to abdominal pain, diarrhea, constipation or alternating diarrhea and constipation. Patients with these symptoms need to go to the hospital in time to improve the relevant tests to clarify the diagnosis. Patients suffering from irritable bowel syndrome need active symptomatic treatment according to the symptoms. Patients with diarrhea can apply drugs such as montelukast to relieve the symptoms of diarrhea. Probiotics can also be appropriately supplemented to regulate the gastrointestinal tract and relieve the symptoms of diarrhea. Normally, you should develop good eating habits, avoid drinking alcohol, avoid spicy and stimulating food, have three regular meals and relieve mental stress.