Mold infections, mycosis enterocolitica, moldy foods and other factors can cause mold in the stool . The main consideration is related to the infection of mold if moldy stool is found during routine stool examination in the hospital. Frequent abuse of antibiotics, hormone drugs . , bathing in public bathhouses or mold infection patients sat on the toilet . All may lead to mold infection, then the virus and bacteria will multiply in the rectal area, stool routine examination will find mold inside the stool. If the intestinal surgery, accidental injury caused by intestinal mucosa or muscle tissue, will lead to fecal pathogenic bacteria infection, stool routine examination will have the manifestation of mycobacterial stool. Eating expired, spoiled, moldy food will induce the appearance of proctitis, due to local bacterial infection, there will also be mycobacterial stool manifestation in the examination.