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Testosterone: Common Questions

Posted By: Dr. Gary Bellman on November 4, 2016

What is Testosterone & how does it affect the body?
 
Testosterone is an important male hormone.  A male begins to produce testosterone as early as seven weeks after conception. Testosterone levels rise during puberty, peak during the late teen years, and then level off.  After age 30 or so, it’s normal for a man’s testosterone levels to decrease slightly every year.
 
Most men of a certain age have enough testosterone.  But, it’s possible for the body to produce too little testosterone. This leads to a condition called hypogonadism.  This can be treated with hormonal therapy, which requires a doctor’s prescription and careful monitoring.  
 
Endocrine System
The body’s endocrine system consists of glands that manufacture hormones.  The hypothalamus, located in the brain, tells the pituitary gland how much testosterone the body needs. The pituitary gland then sends the message to the testicles. Most testosterone is produced in the testicles, but small amounts come from the adrenal glands, which are located just above the kidneys. In women, the adrenal glands and ovaries produce small amounts of testosterone.
 
Reproductive System
About seven weeks after conception, testosterone begins helping form male genitals. At puberty, as testosterone production surges, the testicles and penis grow. The testicles produce a steady stream of testosterone and make a fresh supply of sperm every day.
 
Sexuality
During puberty, rising levels of testosterone encourage the growth of the testicles, penis, and pubic hair. The voice begins to deepen, and muscles and body hair grow. Along with these changes comes growing sexual desire.
 
There’s a bit of truth to the “use it or lose it” theory.  A man with low levels of testosterone may lose his desire for sex. Sexual stimulation and sexual activity cause testosterone levels to rise. Testosterone levels can drop during a long period of sexual inactivity. Low testosterone can also result in erectile dysfunction (ED).
 
Central Nervous System
The body has a system for controlling testosterone, sending messages through hormones and chemicals that are released into the bloodstream. In the brain, the hypothalamus tells the pituitary gland how much testosterone is needed, and the pituitary relays that information to the testicles.
 
Testosterone plays a role in certain behaviors, including aggression and dominance. It also helps to spark competitiveness and boost self-esteem. Just as sexual activity can affect testosterone levels, taking part in competitive activities can cause a man’s testosterone levels to rise or fall. Low testosterone may result in a loss of confidence and lack of motivation. It can also lower a man’s ability to concentrate or cause feelings of sadness. Low testosterone can cause sleep disturbances and lack of energy.
 
It’s important to note, however, that testosterone is only one factor that influences personality traits. Other biological and environmental factors are also involved.
 
Skin and Hair
As a man transitions from childhood to adulthood, testosterone spurs the growth of hair on the face, in the armpits, and around the genitals. Hair also may grow on the arms, legs, and chest.
 
A man with shrinking levels of testosterone actually may lose some body hair. Testosterone replacement therapy comes with a few potential side effects, including acne and breast enlargement. Testosterone patches may cause minor skin irritation. Topical gels may be easier to use, but great care must be taken to avoid transferring testosterone to someone else though skin-to-skin contact.
 
Muscle, Fat, and Bone
Testosterone is one of many factors involved in the development of muscle bulk and strength. Testosterone increases neurotransmitters, which encourage tissue growth.  Testosterone increases levels of growth hormone. That makes exercise more likely to build muscle.
 
Testosterone increases bone density and tells the bone marrow to manufacture red blood cells. Men with very low levels of testosterone are more likely to suffer from bone fractures and breaks.
 
Testosterone also plays a role in fat metabolism, helping men to burn fat more efficiently. Dropping levels of testosterone can cause an increase in body fat.
 
 
When it comes to testosterone therapy and the heart, recent studies have conflicting results and are ongoing. Testosterone therapy should be prescribed & monitored closely by a physician to ensure healthy levels.

For an appointment or consultation with Dr. Gary Bellman, please contact the office or call 818-912-1899



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