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www.reference.com/article/low-testosterone-bc88ac089902d976

Low testosterone is any measurement that falls below 300 nanograms per deciliter, according to Healthline. The condition occurs gradually as men enter old age and results in a decreased libido, hair loss, depression, weight gain, fatigue, irritability, decreased bone density and shrinking muscles.

www.reference.com/article/causes-low-testosterone-cac3a2429bb5fb4f

Low testosterone or Low-T can be caused by obesity, type 2 diabetes or other chronic medical conditions like liver or kidney disease. Testosterone naturally drops as a person gets older.

www.reference.com/article/considered-low-level-testosterone-c09195ac8df0c7ba

The normal testosterone level is 270 to 1070 nanograms per deciliter, and anything below this range is considered a low testosterone level, according to MedicineNet. It is necessary to determine if the low level is due to normal aging or a disorder.

www.reference.com/article/can-low-testosterone-affect-men-407a354327084672

Low testosterone can affect men by decreasing sexual function, causing physical changes, increasing sleep disturbances or causing emotional changes, according to Mayo Clinic. The effects vary from case to case and, in some men, are subtle or absent. Even without symptoms, a man with low testosterone

www.reference.com/article/common-causes-low-testosterone-ec340e1d2500f5e2

Some common causes of low testosterone levels include obesity, hormonal disorders, infections and diabetes type 2. The low limit of testosterone levels in men is 300 nanograms per deciliter, while the upper normal limit is 1000 to 1200 nanograms per deciliter, notes MedicineNet.

www.reference.com/article/signs-low-testosterone-men-51bf95ecdfde7cbe

Signs of low testosterone in men include low fertility, low sex drive, erectile dysfunction, sparse facial or body hair, and growth of breast tissue, according to Everyday Health. Men with low testosterone may experience low semen volume, increased body fat, reduced bone mass and fatigue, reports He

www.reference.com/world-view/side-effects-low-testosterone-men-2ed16cd5fd7112c9

Symptoms of low testosterone levels in men include depression, fatigue, weakness and the loss of sex drive, according to WebMD. Testosterone levels usually begin to decline after age 30. Low testosterone levels cause the bones to lose density, increasing the chances of fractures. Normal testosterone

www.reference.com/article/normal-testosterone-level-b94af267e7300385

Normal blood levels of testosterone vary between 300 and 1,000 to 1,200 nanograms per deciliter, according to WebMD. Testosterone is a sexual hormone responsible for the development of male sexual traits after puberty. Most men start experiencing a normal decline in testosterone levels after the age

www.reference.com/article/tests-available-check-low-testosterone-levels-2ada5eab0e078205

The most common test for checking testosterone levels as of 2015 is a blood test, according to WebMD. Total testosterone levels for men should fall between 270 and 1,070 nanograms per deciliter, while free testosterone levels should be from 50 to 210 picograms per milliliter.

www.reference.com/article/testosterone-produced-7daaf66a425bd8b1

According to WebMD, testosterone is produced primarily by the testes, the main male organs of reproduction, though it is also produced in small amounts by women's ovaries. Testosterone production in the testes is conditioned by multiple factors that are mainly related to the production and maintenan