The pain in the lower abdomen and testicles is recommended to go to the hospital for relevant examinations to clarify the possible causes.1. Testicular inflammation and epididymitis will first appear as pain in the testicles and swelling of the testicles. The pain is usually caused by spermatorrhea due to orchitis, so there will be pain in the small abdomen or groin area, accompanied by obvious swelling of the scrotum and redness of the skin, the pain is more obvious after activity, and the pain can be reduced after resting or elevating the scrotum. The pain can gradually radiate down to the lower abdomen and even appear as a symptom of back pain. This is due to acute ischemia of the testicles and ischemia of the spermatic cord, resulting in testicular pain and abdominal pain, which requires ultrasound examination of the spermatic cord and testicles, and early surgery after diagnosis. 3. Stones in the lower part of the ureter can cause pain in the testicles of the external genitalia or radiating to the abdomen, accompanied by frequent urination, urinary urgency or hematuria. The testicles are normal in size and need an ultrasound examination of the urinary system to rule out the presence of stones.