Hidden pain in the left side of the abdomen in men may be related to prostatitis, urinary stones, intestinal cramps and other causes. 1. Prostatitis: The long-term inflammatory stimulation of the prostate gland leads to inflammatory enlargement of the prostate gland, which may also lead to inflammation of the seminal vesicles. In severe cases, it can lead to swelling and discomfort in the vas deferens travel area and symptoms of vague pain in the left side of the abdomen. 2. urinary stones: for example, stones in the lower end of the left ureter can lead to radiating pain in the left ureteral tract, resulting in a vague pain in the left side of the abdomen. Some people may also be accompanied by urinary pain, hematuria, urinary frequency. 3. Intestinal spasm: when intestinal spasm occurs, due to the strong contraction of the smooth muscle of the intestinal wall during intestinal spasm, it can also cause the symptoms of vague pain in the left side of the abdomen. It is recommended that men with vague pain in the left side of the abdomen go to a regular hospital in time, to clarify the cause of the disease, under the guidance of the doctor for standardized treatment, so as not to delay the condition to bring adverse effects on the body.