What condition causes one testicle to be larger than the other?

Some men have asymmetrical testicles—i.e., one testicle is noticeably larger than the other. What causes this? It may be related to congenital testicular hypoplasia, which can lead to atrophy of one or both testicles and result in abnormal testicular appearance. Additionally, testicular trauma and testicular cancer are also high-risk factors for this symptom and warrant prompt attention and preventive measures.

What condition does unilateral testicular enlargement indicate?

In general, unilateral testicular enlargement may reflect normal physiological variation—or it may stem from pathological conditions such as testicular atrophy or hydrocele. A detailed analysis follows:

I. Physiological Factors

If the size difference between the two testicles is minor and no associated discomfort is present, the asymmetry is usually attributable to individual developmental variation and is considered normal. However, if the disparity is marked—for example, one testicle is the size of a ping-pong ball while the other resembles a broad bean—this is abnormal and warrants timely medical evaluation.

II. Pathological Factors

1. Testicular Atrophy

Testicular atrophy may occur following trauma or due to declining sex hormone levels, leading to significant volume discrepancy between the two testicles and resulting in apparent asymmetry.

2. Hydrocele

Unilateral testicular enlargement may also be caused by hydrocele. Accumulation of fluid within the tunica vaginalis can compress and damage testicular tissue, producing symptoms such as unilateral testicular enlargement and referred pain.

       Beyond the above common causes, testicular cancer may also manifest with this symptom. Prompt medical consultation is recommended to determine the underlying cause and initiate appropriate treatment. Maintain local hygiene routinely to prevent infection.

We hope the above information is helpful. Wishing you good health and happiness!