Why is my left testicle swollen with pain?

Your left testicle might be swollen and painful for a few reasons. One possibility is testicular torsion. This happens when the cord that supplies blood to the testicle twists, causing sudden and severe pain along with swelling. This condition is a medical emergency and needs quick treatment to save the testicle. Another common cause is epididymitis, which is an infection or inflammation of the tube behind the testicle. This usually causes that builds up more slowly and can make the testicle look swollen. Varicoceles (swelling of veins in the testicle) and hydroceles (build up of fluid in the testicles) can cause pain and swelling in one testicle. Hernias can also affect either testicle. Fluid retention from other disease processes - like heart, kidney, or liver failure - can cause swelling throughout the body, including the testicles. To better understand what might be causing your symptoms, you can start by taking a free symptom checker assessment to help identify possible conditions. Your doctor can then help by asking about your symptoms, doing a physical exam, and using tests like an ultrasound to see what is happening inside. Getting help right away ensures you get the correct treatment, whether it means surgery or medicine.