It is very common for guys to have one testicle that is slightly smaller than the other. It is also common to have one testicle hang lower in the scrotal sack. Since you don’t mention other symptoms such as pain or other lumps/bumps in your scrotal sack, you probably don’t have anything to worry about. Examination of your penis and testicles is a normal part of your medical care so you should talk to your health care provider about this at your next visit.

If you have any of the following symptoms, you should make an appointment with your health care provider immediately.

• One testicle is MUCH smaller or larger than the other one
• One or both of your testicles SUDDENLY change in size or shape
• You feel a hard lump or nodule when you do a self-testicular exam
• You have pain or discomfort in the area of your testicle(s)
• You’ve had an injury to your testicle(s)

Sudden severe pain (the kind of pain that wakes you up in the middle of the night) is serious and could mean that one of your testicles has twisted. This is called “testicular torsion.”  This is a medical emergency that requires medical care right away.​