No, it is not a serious problem. You need to release your sexual tension by masturbation. You did find that it worked so you found your own answer.
When the testicles are hit, they can swell, but first of all it is usually the scrotum, not the testicles themselves. This is usually caused by the bruising of the scrotum, which like other parts of the body can lead to swelling. Time, and icing, can reduce swelling, however, if swelling continues for longer than a day, or there is a puncture, rupture or other sever problem see a doctor immediately.
One common problem that can cause scrotal swelling in men is Congestive Heart Failure (CHF). If you are experiencing swelling in your lower extremities and in the testicles, I would go see a cardiologist, as the problem with the testicles is not from the testicles themselves, but from a problem with the heart. Other problems that could cause testicular swelling would be a testicular torsion (rip inside the testicle), epiditymitis (infection of the sperm duct inside the testicle), and a testicular hernia (part of the testis is protruding from the sac that surrounds them under the skin). These conditions are very painful and may require emergency attention. One reason that could cause swelling in the testicles are tumors (cancerous). These tumors are mainly painless. However, do not be afraid, as just because you may have a tumor, it is not always the case that this tumor is malignant. Sources: nursing student
To keep the sperms at a healthy temperature. When they are too cold they go up inside the body but the body temperature is generally too warm for the sperms and that is why they hang in a scrotum.
how hard are you hitting them?
As long as there is not a drastic difference.
Yes its a big problem!
Yep. Swelling can be a problem if the bar is too short but its completely normal!
There were a bunch of Polish resistance fighters messing up supplies to Germans in Russia
No. Size of the penis or testis has nothing to do with fertility.
The term bilateral means on both sides. So in this phrasing it just means that both testicles have descended from the abdomen into the scrotum. This is what is supposed to happen. It is considered problematic if both testicles have not descended into the scrotum by the time a boy is 1 year old.
A lump in your foot could be soft tissue swelling, a bony problem or a skin problem.
Smell his underwear. If they smell like someone's been there, you know you have a problem, for sure!