What problem is it if the testicles and a line in the left waist hurt?

Patient's question:

Left testicle and left waist connected by a line in pain~~~~Pain when sitting or standing, only lying on the right side! Previously sat on a stone bench for 2 hours~~before the problem appeared! No problem with the right waist
Age: 20
I have a habit of masturbation (also for 6 years), ointment and didn't work~~There's a small issue with urination too! (Urination improved after taking traditional Chinese medicine) Pain in the waist and testicles makes walking or riding a bicycle a problem!
Please doctor~~What is this disease? Is it serious?

Doctor's answer:

There are many causes that can trigger testicular pain, such as orchitis, epididymitis, varicocele, hydrocele, chronic prostatitis, seminal vesiculitis, herniated disc, and so on. These conditions can all cause testicular pain. If there is no heavy physical labor, and you experience fatigue and testicular swelling and pain, it is recommended to visit a urology department for examination to rule out inflammation of the prostate.
Symptoms of pain or a heavy sensation should be addressed. Therefore, it is advised to go to a regular hospital's urology department for relevant tests to identify the cause and receive appropriate treatment.