Diarrhea after taking probiotics may or may not be a normal phenomenon, belonging to the adverse reaction of drugs, such as allergies. 1. Normal: probiotics have the function of regulating the balance of intestinal flora, which can promote gastric peristalsis, thus prompting the discharge of stool. Therefore, diarrhea may occur after taking probiotics, most of which is normal. 2. Unusual: Some patients may be allergic to probiotics, which can lead to allergic reactions, such as diarrhea and skin rashes. If patients take probiotics for a long time may trigger a new flora imbalance, diarrhea symptoms. After taking probiotics, if the diarrhea is severe, you should go to the hospital in time, under the guidance of the doctor. If you need to use probiotics, you should consult a professional doctor before use, and strictly follow the doctor’s instructions for taking, do not use on your own at will to avoid adverse effects.