What are risk factors for low testosterone?
Many systemic diseases (e.g. diabetes mellitus, metabolic syndrome, coronary artery disease, liver disease, chronic obstructive pulmonary disease, rheumatoid arthritis, other inflammatory conditions and generalized infections) correlate with low testosterone levels.1-3,5-9 Therefore, signs or symptoms of hypogonadism can be an early indication leading to diagnosis of an underlying condition. In addition, obesity, injury to the testes, genetic factors and normal aging can contribute to hypogonadism.1,6 A summary of the risk factors can be found in the table below. Although many risk factors for low testosterone are not modifiable, improving diet, moderating alcohol consumption, losing weight and reducing stress can be helpful to men wanting to reduce the risk of hypogonadism.
|Obesity||Up to 79% of obese men have hypogonadism.1|
|Diabetes||Up to 81% of men with type 2 diabetes have hypogonadism.2-5|
|Metabolic syndrome||Up to 35% of men with the metabolic syndrome have hypogonadism.6-8|
|Chronic diseases||Chronic diseases such as cardiovascular diseases, liver or kidney disease, and rheumatoid arthritis may be risk factors for low testosterone.
In some cases, it is not clear whether the chronic illness is a cause or a consequence of low testosterone. It is likely that the causal relationship is bi-directional.
|Normal aging||Testosterone levels decline with age in most men.
After the age of 40 years:
bioavailable testosterone decreases on average -2 to -3% per year.11In older men (over 60 years of age):
The average rate of decrement in total testosterone levels has been found to be 110 ng/dL every decade.12
|Medications||Statins13-15 (which are widely prescribed for dyslipidemia), glucocorticoid medications16,17 and opioid treatment18-20 for chronic pain are well known medications that reduce testosterone levels and may precipitate hypogonadism.
5-alpha reductase inhibitors, which inhibit DHT synthesis, impair sexual function21-23 and reduce testosterone levels.24
|Pituitary disorders||Pituitary dysfunction can impair the release of LH and FSH, which are hormones that affect normal testosterone and sperm production, respectively.25,26|
|Cancer and cancer treatment||Cancer of the testes or pituitary tumors can lead to low testosterone production.
Chemotherapy or radiation therapy can also interfere with testosterone production.25,26
|Injury to the testes||Testicular damage can cause reduced testosterone production.25,26|
|Hemochromatosis||A genetic disorder causing the body to absorb too much iron from the diet. Hemochromatosis can result in the deposition of iron in various body organs, including the hypothalamus, pituitary and testes, which impairs testosterone production.25,26
It is now recognized as a common disorder and 1 in 200 people of northern Europe may be at risk of developing iron overload.26
|HIV/AIDS||The HIV virus can cause low levels of testosterone by affecting the hypothalamus, pituitary and testes.25,26|
|Klinefelter’s syndrome||A genetic deficiency in testosterone production. Affects between 1 in 500 and 1 in 1000 men.25,26|
|Hypothalamic disorder||Abnormal development of the hypothalamus and is a risk factor for low testosterone (a.k.a. Kallmann's syndrome).25,26|
|Mumps orchitis||A mumps infection that involves the testes as well as the saliva glands may result in long-term damage affecting testosterone production if it occurs during adolescence or adulthood.25,26|
|Undescended testes||Failure of one or both of the testes to descend at birth (which occurs in approximately 1 in 4 boys born prematurely and 1 in 20 boys born at term) may lead to a failure of the testes to develop properly if the condition does not correct itself naturally within the first year of life or if not corrected in early childhood.25,26|