A study in the American Journal of Epidemiology shows that hard exercise may increase a man's risk for testicular cancer.

Cyclist Lance Armstrong recovered from testicular cancer that had spread to his brain and lungs, and two years later, he won the most famous endurance race in the world, the Tour de France. The rate of testicular cancer has increased more than 50% in the last 20 years, occurring most commonly in white men between the ages of 30 and 35.

Don't stop exercising. This is the only study that shows the association between exercise and testicular cancer. You are at increased risk if you have family history of this cancer, had testicles that did not drop from your belly into your scrotum by the first year of life, have HIV, are exposed frequently to high temperatures, eat a high fat, particularly high saturated fat diet or your mother took hormones while she was pregnant with you.

Testicles start inside a man infant's belly, but drop into the scrotum in the first year of life because they are damaged by the normal body temperature of 98.6 degrees F. If they do not drop into the scrotum by age two, they should be placed there by surgeons usually before age five.

1)A Srivastava, N Kreiger. Relation of physical activity to risk of testicular cancer. American Journal of Epidemiology, 2000, Vol 151, Iss 1, pp 78-87.

2) AJ Sigurdson, S Chang, JF Annegers, CM Duphorne, PC Pillow, RJ Amato, LP Hutchinson, AM Sweeney, SS Strom. A case-control study of diet and testicular carcinoma.Nutrition and Cancer - an International Journal, 1999, Vol 34, Iss 1, pp 20-26.

Reported 51/23/00; checked 8/9/05

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