I've been having some pain in my left testicle on and off. What could be causing this?

Pain in the left testicle that comes and goes can be caused by various factors, such as **muscle strain**, **epididymitis** (inflammation of the epididymis), or even **testicular torsion**, although the latter is typically more sudden and severe. If the pain persists or is accompanied by swelling or other symptoms, it's important to see a healthcare provider for an evaluation and to rule out any serious conditions.