Feeling pain in my testicles, when i a run my testicles hurt . i check my testicles and i felt my 2 testcles but i felt i little tiny ball leftside?

See doctor: Any pain in testicle in young man should be checked. If pain worse with exercise / running in some rare instances testicles can " twist" - it is extremely painful and it is emergency. ( testicular torsion) , other lumps and bumps out of usual should be examined too. Do not feel embarrassed about it . It is very serious health concern. talk to your parent - call your doctor .