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.
Testosterone is an important hormone in the development of any male. Production of this hormone basically takes place within the testicles. This hormone plays a role in the development of bones, muscles, bone density, sperm and red blood cell production.
When individuals suffer from low testosterone levels, they are likely to experience a diminished sex drive. This means the man does not feel like having sex like normal men do. The man may become infertile and experience change in sleep patterns. Other symptoms of low testosterone levels include emotional changes and sexual dysfunction.
Some of the most common causes of low testosterone levels in males include injury that affects the testicles, medical conditions, such as testicular cancer, and diseases like HIV/AIDS, chronic liver and kidney disease, hormonal issues and being overweight.
While a decline in testosterone levels is normal as people grow old, in situations such as mentioned above treatment may be necessary, notes WebMD. Testosterone injections, daily gel or patch and implantable testosterone pallets are among the options available for treatment.