Young Men's Health
A man’s testicles are very sensitive so even a minor trauma can cause discomfort. There can be many reasons for your pain. The pain can be coming from your left testicle itself, the tissues around the testicle, or someplace in your abdomen. For example, problems such as kidney stones and hernias can also cause pain in the testicle(s). If pain is severe, comes on suddenly, or is associated with symptoms like fever, chills, or blood in your urine, you should get medical help right away. Otherwise, make an appointment with your health care provider if mild or moderate pain in your testicle lasts more than a few days, if coughing or sneezing makes the pain worse, or if you notice any lumps or swelling of your testicles.
Check out the links below for more information:
https://youngmenshealthsite.org/guides/testicular-self-exam/