Hidden pain on the lower sides of the lower abdomen may be a different lesion in men and women. If you look from the outside in, it could be a skin and muscle problem, which is the same in men and women, and skin and muscle problems often have a clear history of exercise or exertion, making it easy to make a differential diagnosis from the history. Common to both men and women is a bilateral ureter, which has the potential to cause pain if there is inflammation, stones, or fluid buildup in both ureters. Inflammation of the bladder can also be present in both men and women with vague pain on both sides of the lower part of the abdomen, and a urologic ultrasound is needed to make a differential diagnosis. In men, bilateral varicocele may cause pain on both sides of the abdomen, and ultrasound of male genitals is needed for differential diagnosis, while in women, it may be caused by gynecological pain on both sides of the abdomen, and appropriate gynecological examination is needed for differential diagnosis.