Most kidney infections are a result of bacteria that spreads from the lower urinary tract. This bacteria may be introduced through catheters or other medical devices.

Alcoholism is a chronic disease in which the victim loses control over drinking, resulting in adverse physical, emotional, and social consequences.

The large intestine consists of the colon and rectum, which make up the final portion of the digestive tract. Cancer of the colon is one of the most common types of cancer, and accounts for 10 percent of cancer deaths.

Coronary heart disease, the leading cause of death in America, is the clogging of the arteries that supply the heart with blood. It's caused by excess cholesterol and other debris that builds up inside the vessels, reducing blood flow.

Inguinal (ING-gwih-nal) hernias occur when a weakness in the abdominal wall allows internal organs such as the intestines to bulge out. They are more likely to affect men because of a natural internal weakness left from the path by which the testicles descend into the scrotum, just before birth.

The prostate is a small organ located below the bladder, which produces one of the fluid components in semen. There are three types of prostate problems that can arise: infection, enlargement, and cancer.

The prostate gland is a male sex organ located below the bladder and around the urethra [yur-E-thra]. During sexual activity, it produces a fluid that combines with sperm to form semen.

The most common cause of enlarged testicles is an infection that causes inflammation of the epididymis (ep-uh-DID-ih-mis), a long coiled tube behind each testicle.

Gout (gowt) is a type of acute arthritis caused by elevated levels of uric (YOUR-ick) acid in the blood. Your body creates uric acid when it metabolizes protein.

A hair transplant is a procedure in which grafts of hair from the back or sides of the head are moved to balding areas on the crown or forehead. After surgery, your scalp begins to sprout new blood vessels, which allowthe grafts to grow in their new location.

Testicular cancer is the most prevalent cancer among American males age 15 to 35. But when found early, the cure rate is very high. A testicular self-exam, or TSE, is one good way to detect possible problems.

Impotence is a condition in which a man is unable to achieve an erection or sustain an erection long enough for sexual intercourse. Erection problems are common and may have a physical and/or psychological basis.

Sexually transmitted diseases, or STD's, encompass a wide variety of infections. Using condoms can lower your risk for some STD's, but abstinence is the only sure way to avoid them.

Cholesterol is a waxy substance manufactured by the liver from saturated fat. You also consume dietary cholesterol when you eat fatty meats and dairy products.

For men, maintaining good health involves much of the same advice that's given to women: eat a healthy, low-fat diet; watch your cholesterol; exercise regularly; manage your stress; and avoid smoking.

There are many possible causes of impotence, the inability to achieve or maintain an erection. When factors like complications from medication, psychological conditions, and drug use have been eliminated, and treatments such as medication, vacuum devices and hormone therapy are ineffective, a doctor may suggest a penile (PEE-nile) implant.

The prostate (PROSS-tate) gland, located at the base of a man's bladder, produces seminal fluid. Cancer of the prostate is the second leading cause of cancer in men, and is more prevalent in African-American men.

It's easy to get injured while playing sports if you're not in top shape. The most common problems are twisted ankles, knee injuries, sore muscles, pain in the side, blisters, damage to the Achilles tendon in the heel, and shin splints.

Several versions of a male contraceptive are currently being studied. The mechanisms used to inhibit fertility either suppresses sperm production by hormonal or nonhormonal means, or prevents the fertilizing ability of sperm.

Urethritis (YUR-a-THRYT-is) is the inflammation of the urethra (you-REE-thruh), which is the tube that carries urine from the bladder tothe outside of your body.

The urinary tract is made up of the kidneys, which filter waste; the ureters (your-REE-ters), which transport urine to the bladder; and the urethra (you-REE-thruh), the tubes through which urine leaves the body.

A vasectomy (vah-SEK-toe-mee) is a surgical form of birth control for males. The procedure involves cutting and tying off the tubes that carrysperm from the testes to the penis.

A vasectomy (vah-SEK-tuh-mee) is a sterilization procedure that severs the vas deferens (vahs DEF-er-enz), which is the tube that transports sperm from the testicles.

Premature ejaculation can be defined as ejaculation which occurs before a man wishes it, and with minimal physical stimulation. Men with this condition may consistently ejaculate within seconds after penetration, or even before penetration takes place.

Male-pattern baldness is a genetically determined condition, which results in a predictable pattern of hair loss. The scientific name for pattern baldness is androgenetic alopecia (ANN-droe-jih-NET-ick al-oh-PEE-shuh).

Testosterone (tess-TOSS-tuh-roan), the primary male hormone, is produced in the testes (TESS-teez), and governs many functions throughout your body.