Because testosterone is so important to the overall well-being of a man, having low testosterone can really cause a lot of different symptoms. One of the main ones is sexual performance. So having low sex drive, erectile dysfunction, poor energy levels, kind of feeling that at the end of the work day, you want to come home and take a nap rather than continue with your day. Poor sleep. Mood issues, where you’re either irritable or you have depressive type symptoms, even your outlook on life. All of these things can be impacted by low testosterone levels. If you do feel like you have one or more of these symptoms, it’s important to get your testosterone levels checked, either with your primary care doctor or a men’s health specialist.