I'm experiencing some pain in my left testicle, and it's kind of radiating from my lower abdomen on the left side down to there. Can you help me understand what's going on?

The symptoms you are describing could be due to a condition called epididymitis, which is inflammation of the epididymis. I recommend taking an over-the-counter pain reliever such as ibuprofen (e.g. Advil) to help with the pain and inflammation. It is important to also rest, wear supportive underwear, and apply a cold pack to the area. However, it is crucial to see a doctor for proper evaluation and treatment, as antibiotics may be needed if the cause is bacterial.