Small lower abdomen refers to the lower abdomen. There are many reasons for small abdominal distension and discomfort, including urinary tract lesions, intestinal tract lesions, female uterine adnexal lesions, male prostate lesions, etc. 1. Urinary tract lesions: when cystitis, bladder stones, bladder tumors, bladder tuberculosis, ureteral end stones and other urinary tract lesions, there will be a small abdominal distension and discomfort. 2. Intestinal lesions: including proctitis, appendicitis, appendicitis, colitis or intestinal tumors and other diseases, there may be small abdominal distension and discomfort. 3. Female uterine adnexal lesions: including uterine inflammation, uterine fibroids, ovarian tumors and other female uterine adnexal lesions, which can lead to abdominal distension and discomfort, and may be accompanied by vaginal bleeding. 4. male prostate lesions: male prostatitis, prostate tumors and other diseases, can also lead to abdominal distension discomfort. In short, there are many reasons for abdominal pain and discomfort, and it is necessary to consult a doctor in time to clarify the cause of the disease.