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Cancer is a group of related diseases. In all types of cancer, some of the body's cells begin to divide without stopping and spread into surrounding tissues.

Normally, new cells form as you need them, replacing old cells that die. Sometimes, this process goes wrong. New cells form when you don't need them, and old cells don't die when they should. The extra cells can form a tumor. Tumors can be benign or malignant. Benign tumors aren't cancer. Malignant tumors are cancer, and the cancer cells can spread to nearby tissues. They can also break away and spread to other parts of the body.

Children can get cancer in the same parts of the body as adults, but there are differences. Childhood cancers may happen suddenly, without early symptoms. Some types can often be cured. The most common children's cancer is leukemia. Some of the other more common types of cancer in children include brain tumors, lymphoma, and soft tissue sarcoma.

Symptoms and treatment depend on the type of cancer and how advanced it is. Treatments may include:

• Surgery
• Radiation therapy
• Chemotherapy
• Stem cell transplants
• Targeted therapy, which uses drugs or other substances that attack specific cancer cells with less harm to normal cells

NIH: National Cancer Institute

Testicular cancer is a cancer that develops in the tissues of one or both testicles. The testicles, or testes, are part of the male reproductive system. They make male hormones and sperm. They are two egg-shaped glands inside the scrotum, a sac of loose skin that lies below the penis. You can get cancer in one or both testicles.

Testicular cancer is very rare. You can get it at any age, but it is most common in men between the ages of 20 and 39. It is also more common in those who:

• Have had abnormal testicle development
• Have had an undescended testicle, a condition in which one or both testicles fail to move into the scrotum before birth
• Have had testicle cancer before
• Have a family history of the cancer
• Are White

The symptoms of testicular cancer may include:

• A painless lump or swelling in either testicle
• A change in how the testicle feels
• A dull ache in the lower abdomen (belly) or the groin (the area where the thigh meets the abdomen)
• A sudden build-up of fluid in the scrotum
• Pain or discomfort in a testicle or in the scrotum

To find out if you have testicular cancer, your health care provider may use:

• A physical exam.
• Blood tests.
• An ultrasound of the testicles.
• An inguinal orchiectomy, which is a procedure to remove the entire testicle. A tissue sample from the testicle is viewed under a microscope to check for cancer cells.

Testicular cancer can usually be cured.The treatment options include:

• Surgery (if the testicle has not already been removed during diagnosis).
• Radiation therapy.
• Chemotherapy.
• High-dose chemotherapy with stem cell transplant.
• Surveillance, which might be done after surgery. It means that your provider will closely follow your condition with regular exams and tests. You won't get any further treatment unless there are changes in your test results.

Some of the treatments may also cause infertility. If you may want to have children later on, you should consider sperm banking before treatment.

After you have finished your treatment, you will need regular follow-up testing to make sure that the cancer has not come back. If you have had cancer in one testicle, you have a higher risk of getting cancer in the other testicle. So it's important to check the other testicle regularly and let your provider know if you notice any changes or unusual symptoms.

NIH: National Cancer Institute