What can be wrong when one of your testicals feel like a ball?

If one of your testicles feels unusually hard or like a ball, it could indicate several issues, including testicular torsion, which is a medical emergency, or the presence of a lump or mass, such as a cyst or tumor. Other potential causes could include an infection or inflammation, such as epididymitis. It's important to seek medical attention promptly to determine the underlying cause and receive appropriate treatment.