The organs in the left lower abdomen of the stomach are mainly part of the descending colon, sigmoid colon, part of the small intestine, ureter, ovaries and fallopian tubes in women, and part of the bladder and uterus, and the spermatic cord in men. The discomfort and pain that occurs in the left lower abdomen is caused by a variety of diseases, such as left lower abdominal cramps and lumbago in the lower and middle ureter, and pain in the perineum may be caused by ureteral stones. In elderly people with frequent constipation, sudden severe abdominal pain in the lower left abdomen may be caused by sigmoid colon torsion necrosis, women with discomfort in the lower left abdomen may also have adnexitis, endometritis, ovarian cysts, and pain in the abdominal area may be caused by the above diseases. There are many kinds of organs in the lower left side of the stomach, and it is important to go to the hospital for examination, such as abdominal ultrasound and colonoscopy to find out if there are lesions in the lower left side of the organ.