Diarrhea from probiotics may be the result of a Hirschsprung’s reaction, which is essentially an “improvement reaction”. Hirschsprung’s reaction is a phenomenon in which symptoms worsen in the early stages of treatment, and then ease and improve with continued treatment. Probiotics inhibit the proliferation of harmful bacteria in the intestinal tract and regulate the balance of intestinal flora to relieve diarrhea symptoms. When probiotics inhibit the harmful bacteria, the harmful bacteria may release a large amount of toxins, leading to worsening of diarrhea symptoms and Hirschsprung’s reaction, which can be improved if you keep taking probiotics. Generally, the symptoms of Hirschsprung’s reaction to probiotics are not very serious and can be left untreated, but care should be taken to distinguish it from an allergic reaction. The main symptoms of an allergic reaction are rash, asthma, and dehydration. In addition, there may be other factors that cause the symptoms of diarrhea after taking probiotics, it is recommended to consult a doctor in time, with the help of the doctor to clarify the cause of the disease, and targeted treatment and therapy.