The most common symptom of testicular cancer is a lump or swelling in one of your testicles.
The lump or swelling can be about the size of a pea, but may be larger.
Most lumps or swellings in the scrotum aren't in the testicle and aren't a sign of cancer. But they should never be ignored. Visit your GP as soon as you notice a lump or swelling in your scrotum.
Testicular cancer can also cause other symptoms, including a:
dull ache or sharp pain in your testicles or scrotum, which may come and go
feeling of heaviness in your scrotum
change in the texture or increase in firmness of a testicle
difference between one testicle and the other
Information sourced from the NHS website. Remember, if in doubt, visit your GP. It could save your life.