What are the factors that cause one testicle to be larger than the other?

Patient's question:

The testicles are of uneven size, with one being smaller.

Doctor's answer:

The testicles of a normal person are not the same size on both sides, but the difference is usually not significant. If both testicles were roughly the same size in the past and one suddenly becomes significantly larger recently, it is important to seek medical attention promptly. If one testicle enlargement is accompanied by fever and local pain, it could be epididymitis or orchitis. If the testicle enlargement occurs without any symptoms, it should be considered whether there is a possibility of a testicular tumor, and timely examination is necessary—do not be careless. It is recommended to go to a public, reputable urology department for examination and treatment. Testicular ultrasound and palpation are required to confirm the diagnosis before further treatment.

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