Rectal white moss may be due to proctitis, rectal ulcers, rectal polyps and other causes of the phenomenon. 1. proctitis: this kind of disease can appear diarrhea and constipation alternately, mucus stools, rectal white moss and other phenomena, most of them are caused by bacterial viral infections, you can take antibiotics such as roxithromycin or acyclovir and other antiviral medicines for treatment. 2. Rectal ulcer: this kind of disease can appear rectal white moss, the appearance of ulcer foci, mucosal congestion and edema, mucus, pus and blood stools and other phenomena, can be treated with medicines such as mesalazine, azathioprine, budesonide and so on. 3. Rectal polyps: constipation or diarrhea can occur, mucus stools, change in bowel habits and other symptoms, rectal polyps in the population is usually removed through surgery. Diseases can be diagnosed by differential diagnosis under colonoscopy, and drugs need to be applied under doctor’s advice.