Thinning stools and the feeling of not being able to pull clean may be caused by chronic colitis, indigestion, rectal cancer and other diseases. 1. Chronic colitis: the main symptoms of patients are long-term recurring diarrhea, thin stools, mucus, pus and blood stools, abdominal pain, weight loss, etc. It is a kind of disease caused by long-term chronic inflammation damage in the colon. 2. Dyspepsia: it is divided into two types: organic dyspepsia and functional dyspepsia. As the digestive function of patients is affected, it can lead to thinning of stools and feeling of not being able to pull them out cleanly when defecating, and usually accompanied by epigastric discomfort, acid reflux, belching and other symptoms. 3. Rectal cancer: it is a kind of malignant digestive tract tumor related to intestinal polyps, obesity and other factors, and patients may have stool shape change, unclean bowel movement and so on. There may be other reasons for the thinning of stool and the feeling of not being able to pull clean, so you can go to the hospital for examination and take corresponding measures for treatment according to the doctor’s instruction.