Why is one testicle larger than the other?

The size difference between testicles is normal and usually not a cause for concern. It is common for one testicle to be slightly larger or hang lower than the other. This asymmetry is typically due to differences in blood flow or the way the testicles developed. If there is a sudden change in size or if there is pain or discomfort, it is important to see a healthcare provider for further evaluation.