Low testosterone levels may cause or contribute to symptoms such as: Reduced sexual desire / low libido Fewer spontaneous erections Brain fog Impotence Erectile dysfunction (ED) Infertility Reduced muscle mass and strength Weight gain and belly fat Decreased bone density Fatigue Changes in sleep patterns Lack of motivation Difficulty concentrating Depression Hair loss The age-related decline in testosterone along with the associated symptoms is referred to as andropause—similar to, but different from, female menopause. Age isn’t the only factor that plays a role in andropause. Stress levels, poor nutrition, lack of exercise, and environmental toxins also contribute to hormonal imbalance which is the root cause of many chronic health problems, as well as an increased risk of serious disease. The good news is that hormone deficiencies and imbalances are correctable.