Patients who have left testicular pain accompanied by pain in the lower abdomen. First, consider the possibility of left testicular infection, left varicose veins, and left epididymitis. Secondly, male prostatitis may also lead to testicular pain as well as pain in the small abdomen, and patients with prostatitis also have symptoms such as frequent urination, painful urination and white dripping, etc. In addition, stones in the lower part of the left ureter may also cause symptoms of left testicular pain and pain in the small abdomen. Finally, it is also important to consider the possibility of external injury. It is suggested that once patients have such symptoms, they must go to the hospital for examination in time to exclude the possibility of varicose veins, stones and other diseases as soon as possible. If the examination is for this malignant disease, it must be treated by surgery as soon as possible, and if it is caused by reproductive infection, antibiotic drugs are needed for treatment.