Diarrhea can be relieved and treated with probiotics such as Lactobacillus, Bifidobacterium, and Bacillus subtilis diarrhea. Diarrhea is defined as having more than 3 bowel movements per day, more than 200 grams of stool, thin stool texture, and ≥85% water content. It manifests itself as an increase in the volume and frequency of bowel movements, and the stools are not formed. It is associated with infectious factors such as viruses, bacteria, toxins, parasites, fungi, and non-infectious factors such as ischemia, and systemic illnesses such as anaphylactic purpura, uremia, and thyroid crisis can also lead to diarrhea. Probiotics belong to the normal beneficial bacteria in the intestinal tract, is a kind of intestinal microecological agents, can regulate the balance of intestinal flora and maintain the normal function of the intestinal tract, to promote the digestion and absorption of food, to improve the symptoms of constipation, diarrhea, abdominal pain, nausea, loss of appetite, bloating, etc. Commonly used bifidobacteria bifidobacterium lactis triple, bacillus subtilis bifidus and so on. It is recommended to consult a doctor for diarrhea in time, so as to clarify the cause of the disease and then carry out targeted treatment. In addition, all of the above medications should be used under the guidance of a doctor and should not be used without authorization.