Testicle Size Difference: What's Normal & When to See a Doctor

It is normal for one testicle to be slightly larger than the other. In fact, most men have a slight difference in size between their testicles. This is usually not a cause for concern. However, if you notice a significant difference in size between your testicles, or if you experience pain or discomfort in your testicles, it is important to see a doctor.