The following causes of hidden pain under the left abdomen: 1, enteritis can lead to hidden pain under the left abdomen, enteritis is caused by infection with viruses, bacteria and parasites, and fever symptoms. 2, urinary system diseases can also lead to hidden pain under the left abdomen, such as cystitis, urinary tract infection, etc., the spread of inflammation affects the surrounding tissue cells caused. 3, spinal lesions can also cause hidden pain under the left abdomen, because spinal lesions can affect other parts of the body, resulting in pain, such as pain under the left abdomen. 4. inflammation of the female genitalia or malignant tumors in the body can also cause hidden pain in the lower left abdomen, and sometimes the pain can spread to other parts of the body, such as the legs and waist. 5. menstrual pain in women can also lead to pain in the lower left abdomen, but the pain will gradually ease after the menstrual period. 6. varicocele and epididymitis in men can also lead to pain in the lower left abdomen. Pain, along with physical weakness, fever and other symptoms.