Dry stools followed by loose stools may be caused by intestinal diseases, gastrointestinal spasm, intestinal space-occupying lesions, physiological factors and so on. 1. Intestinal diseases: the symptom of dry stools before and loose stools after may be caused by acute enteritis, chronic enteritis, ulcerative colitis, Crohn’s disease and other intestinal diseases. 2. Gastrointestinal spasm: some patients often eat spicy, stimulating food, cold and other foods, may also lead to gastrointestinal spasm, causing dry stools before and after dilute situation, but at the same time will be accompanied by abdominal pain, abdominal discomfort and other symptoms. 3. Intestinal space-occupying lesions: some patients suffer from intestinal space-occupying lesions, such as intestinal cancer, intestinal polyps, etc., which will cause stimulation of the intestinal mucosa, resulting in constipation and diarrhea alternately, and may also have the symptoms of dry stools followed by loose stools. 4. Physiological factors: the stool condition is related to the food intake into the body, if the day before eating a lot of spicy, high-fat, high-protein food, while the next day eating lighter food, it may lead to the situation of dry stools followed by loose stools. The symptoms of dry stools followed by loose stools indicate a change in the nature of the stools, and it is recommended that the patient seek prompt medical attention to determine the cause of the problem.