Symptoms of andropause often occur unexpectedly and are not as clearly defined as the symptoms of women going through menopause. For this reason, symptoms of andropause are often overlooked. You may initially feel “burned out,” depressed, fatigued, or have a lack of sex drive. It’s imperative to a man’s health and general well-being to maintain adequate testosterone levels. Low testosterone levels can cause both physical and mental symptoms. Common symptoms of low testosterone include: Loss of energy, increased fatigue, low sex drive/decreased erectile function, weight gain, loss of muscle mass and strength, irritability or moodiness, increased belly fat, loss of focus, depression and anxiety, insomnia, loss of confidence, decreased sense of well-being. Typically, the most profound drop in testosterone occurs between the ages of 40 and 55, but symptoms can last for men who are well into their 70s.