What Is Testosterone?
Testosterone is a hormone that is necessary for proper muscular development and masculinity. Testosterone is made in the testes (testicles). Women also have testosterone, but in much smaller amounts than in men. If testosterone levels are below normal, a doctor may prescribe one of several types of treatments. However, there is debate about who needs to be treated.
Testosterone levels decrease as men age. Sometimes this lower level of testosterone is termed "andropause" or "male menopause." Symptoms of male menopause may not be caused by low testosterone, but additional research is needed. Many men do not show any symptoms of decreasing levels of testosterone.
Although osteoporosis (brittle bone disease) is usually thought of as occurring mainly in women, the disease in men is commonly caused by low testosterone. Low testosterone levels can cause bones to thin, weaken, and become more likely to fracture.
Low testosterone doesn't always interfere with sex, but it is possible. Some men with low testosterone may experience a drop in libido while others lose interest in sex completely. Low testosterone levels can make sex more difficult because it may be tougher to get or keep an erection. Low testosterone might not be the sole cause of low libido; stress, sleep deprivation, depression, and chronic medical illnesses can also alter a man's sex drive.
Some of the changes that may occur with low testosterone are nonspecific symptoms such as easy irritability, mood changes, poor concentration, and feeling fatigued or having less energy. However, these symptoms may be caused by a condition other than low testosterone.
One of the many functions of testosterone is to help produce sperm. When testosterone levels are low, the "sperm count" can also be low. If the sperm count is very low, the man may not be able to father a child.
Although increased age is the most common cause of decreased testosterone levels in men, there can be other causes. Other common causes include:
You might need to be tested for low testosterone if you have erectile dysfunction (ED), a very low sex drive, low sperm count, loss of body hair, decrease of muscle mass, and osteoporosis. Conditions other than low testosterone could be the underlying cause of one's symptoms. A doctor will want to rule out other conditions before diagnosing and treating low testosterone.
Tests for testosterone levels are done by sampling the blood early in the morning when levels of testosterone are highest. Your doctor may want to run a second test a few days later to check for consistency in testosterone levels measured. Normal testosterone levels range from about 300 to 1000 nanograms per deciliter (ng/dL), although some labs consider 200 ng/dL the cutoff for low testosterone. Your doctor will help interpret the tests for you.
If you are diagnosed with low testosterone, your primary care doctor may suggest you see a specialist such as an urologist or an endocrinologist. Not everyone with low testosterone will need or qualify for treatment. These specialists will help guide your treatment and design an approach to your low testosterone problem that is best for you.
Low testosterone treatment is designed to boost testosterone levels. Studies suggest this increase in testosterone can strengthen muscles, protect bones, and improve sex drive. Testosterone replacement therapy is only recommended for men who have blood levels that show low testosterone. Such treatments can have different effects from one man to another so it is difficult to predict the treatment outcomes for any one individual.
Testosterone injections are the least expensive form of testosterone treatment, but they can be painful. The shots are given about every 7 to 22 days and the body slowly absorbs the testosterone into the bloodstream. Injections can be given into the muscles or implanted as pellets. Testosterone levels can increase and then fall between shots.
Gel or patch treatments for low testosterone are placed directly on the skin. The hormone seeps out of the patch or gel and goes through the skin, and is slowly absorbed into the blood. Gels and patches are applied every day, and as a result, the level of testosterone remains fairly steady. A drawback to these treatments is they sometimes can cause itching, skin irritation, and blisters. In addition, women or children should not come in contact with skin that has been treated with a gel for 2 hours to avoid absorbing any testosterone.
Buccal patches are placed on the gums above the incisors (teeth) about every 12 hours and slowly release testosterone. They are not effective if swallowed. Buccal patches may cause a bitter taste, irritation to mouth tissues and gums, and may cause headaches. Fortunately, these side effects lessen over time. The patient can eat, drink, and kiss others while using buccal patches because they are not directly exposed to testosterone.
Although testosterone therapy has been tried in many individuals, the risks and benefits of this treatment over many years is still not known because such studies are still underway. Testosterone should not be given to men with untreated prostate cancer, untreated sleep apnea, or untreated breast cancer. In some men, testosterone therapy may need to be stopped if the risks outweigh the benefits.
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