I am feeling pain in my left testicle, it started around 10 this morning and still continue, i noticed the left testicle is swollen, very sensitive and painful to the touch?

Testis pain = see Dr: Testicle pain means a trip to the doctor right away because a testicle's blood supply can be twisted off (called torsion). When that happens, the testicle can die. Other causes of testicle pain include trauma, infection, twisting of an appendix of a testicle (a small lump next to a testicle), etc. Since one usually cannot tell if his testicle is twisted, an exam by a clinic or ER doctor is needed.