A few years ago I was doing a longjump in sand and the next day I noticed pain in my left testicle. I figured it was just sore or a strain or something since it went away in like 24 hours. Ever since then every now and than I feel a little pain in that testicle. I felt it yesturday too. It doesnt hurt a lot, only when I squize it. I dont have any lumps on it and this only happens to my left one. My friend hit me in the testicles a few days ago by accident. Could this have anything to do with it? I was also doing some situps a few days ago too so my abdomen is kind of sore. Can this be cause by masterbation too? Has this happen to anyone else? Im very concerned so I would appreciate any help. Im 21 years old in great health.