IF YOU’RE LIKE most guys, a huge part of your identity is wrapped up in your sex drive—so noticing that your sex drive is starting to fall apartcan be incredibly disconcerting. And for some guys, a decreased sex drive can make it feel like their entire sense of motivation or zest for life is gone.

Some men have sex drives that are naturally on the low end of the spectrum—and that’s perfectly OK. A sudden or noticeable shift in your libido, however, is almost always a sign that something is off.

The good news? Most libido issues can be traced back to a specific cause. Here are the nine usual causes of a decreased libido—and what you can do about them.

1. Stress

Most men with a low sex drive think there must be a medical cause for their dip in libido, but the most common reason for a decreased sex drive is stress. I’d estimate that at least 75% of the libido cases I see in my sex therapy practice boil down to stress. Ironically, sex can be a great stress reliever, but if your stress level is through the roof, you’re just not going to be in the mood.

The fix: We all know that we have too much stress in our lives, but so few people actually do anything about it. Take an honest look at your levels of work and personal stress, and make a game plan for taking some things off your plate. Decreasing stress can feel like an impossible task at times, but what better motivation than getting your sex drive back?

2. Bad self-care

If you’re not taking care of your basic physical needs, your libido is going to be one of the first things to disappear. Limited sleep, poor diet, lack of exercise, excess weight, and drug or alcohol abuse—they can all tank your libido.

The fix: If you want your body to perform optimally, you have to treat it right, plain and simple. This is another area where your sex life just may be the motivation you’ve needed to take better care of yourself.

3. Medical issues

Even though medical issues aren’t typically the root cause of sex drive problems, there are a number of medical conditions that can cause your libido to shrink or even disappear altogether. They include: anxiety, depression, diabetes, heart disease, high cholesterol, and thyroid issues.

The fix: It’s a good idea to make an appointment with a doctor for a check-up. He or she can screen you for potential libido-dampening conditions, and give you more suggestions for getting your sex drive back on track.