The area below the stomach is called the pelvis, and there are many organs in the pelvis, which can be categorized into male-specific and female-specific organs, as well as organs common to both men and women. 1. Male-specific organs: prostate, vas deferens, seminal vesicles and other organs. 2. Female-specific organs: organs such as the uterus, ovaries, fallopian tubes, and vagina. 3. Organs common to both sexes, such as bladder, common iliac artery, left internal and external iliac blood vessels, right internal and external iliac blood vessels, sigmoid colon, rectum, appendix, ascending colon, descending colon and other organs. If the pelvic organs have lesions, corresponding symptoms can appear, such as lower abdominal pain, abdominal distension, hematuria, urinary frequency, urinary pain, urinary irritation and other phenomena, you need to consult the doctor in a timely manner, and comply with the medical advice through the abdominal CT, cystoscopy, urinalysis, and other tests for differential diagnosis.