"I'm just tired." "I'm just stressed." "I'm just getting older."
Men don't usually walk into my office saying they think something's wrong. They say they've lost a step. They're softer through the middle. They hit a wall every afternoon. They're not as sharp, their fuse is shorter, and things in the bedroom have changed, though that may take a while to come out.
Most of the people around them haven't noticed. Maybe their wife has.
If this sounds like you, you're not imagining it. Let's look at what low testosterone can look like.
Quick summary: what you need to know
- Symptoms often start quietly. Low energy, less drive, and changes in sex drive and erections are common.
- Testosterone falls slowly with age. It can drop about 1% a year starting in the late 30s.
- Other things can look just like it. Sleep, stress, thyroid, insulin, depression, and medications all matter.
- The number isn't the whole story. Your symptoms, history, and goals matter too.
- Not every man needs testosterone. A good evaluation comes first.
What are the symptoms of low testosterone in men?
The most common symptoms of low testosterone in men are low energy, lower sex drive, changes in erections, less motivation, mood changes, more body fat, and less muscle and strength. Here's how men describe it to me:
- Energy. You run out of gas by mid-afternoon. In my experience, an afternoon crash is a classic sign.
- Drive. You're less motivated at home, at work, and in the gym.
- Sex. Your desire is lower, or you've noticed fewer morning erections or trouble with erections.
- Body. You're softer through the middle and losing muscle, even though you're working out.
- Recovery. Workouts take more out of you, and you're not seeing results.
- Mood. You've got a shorter fuse, or you just feel flat.
- Focus. You feel less sharp.
You don't need all of these. And having some of them doesn't mean your testosterone is low.
At what age does testosterone start to drop?
Testosterone can start dropping about 1% a year in your late 30s. Being older than 45 is a risk factor for low testosterone. The change is slow, so it's easy to miss, and you may write it off as stress or age.
Common doesn't mean inevitable. You can expect some changes and still do something about how you feel.
What else could be causing my symptoms?
Many things can look like low testosterone, so we want a wide lens first:
- Poor sleep and sleep apnea
- Stress and burnout
- Insulin resistance and weight gain around the middle
- Thyroid problems
- Depression
- Alcohol
- Medications
- Heart and blood vessel problems, which can also affect erections
That last one matters. Good erections take good blood flow. New changes deserve a real conversation, and you can learn more about blood flow and erectile health. If your blood sugar looks fine and you still feel off, your insulin may be part of the story.
How do I find out if my testosterone is low?
You find out with a blood test, read alongside your symptoms and your history. Testosterone is usually highest in the morning, so timing matters, and being sick can lower it for a while.
A single number doesn't tell me everything. I want to see your total and free testosterone, what else is going on in your labs, how you feel, and what you want your life to look like. We'd rather look at the whole picture than treat a lab value by itself.
What should I do if I think my testosterone is low?
Start by writing down what has changed and when you noticed it. Then talk with a clinician who'll listen and look at everything, including your sleep, weight, stress, and blood flow.
I know a lot of men don't want hormones thrown at them. Neither do we. Hormones may be part of the conversation, and they may not. Sleep, strength training, nutrition, and stress can all make a real difference, and testosterone isn't right for everyone.
If you're ready to find out what's going on, start with a Foundational Assessment, or read more about testosterone therapy. Your wife or partner is welcome to join your first conversation and your visits too. It often helps to have the person who knows you best in the room.
Frequently asked questions
Can low testosterone cause fatigue?
Yes, low energy is a common symptom. Fatigue has many causes, so it's worth checking what else might be going on.
Can low testosterone cause erectile dysfunction?
It can play a part, and blood flow is often important too. New erectile changes are worth bringing up with a clinician.
Can low testosterone cause weight gain?
Low testosterone is linked to more body fat and less muscle. Insulin, sleep, and activity matter too.
Can I raise my testosterone naturally?
Sleep, strength training, nutrition, and a healthy weight are all worth working on. They may help, depending on what's causing your symptoms.
Do women have low testosterone too?
Yes, women make testosterone too. Our testosterone therapy page talks about men and women.
See if AgeWell is right for you
This article is for education and isn't a substitute for personalized medical advice. Talk with your clinician about your own situation. If you have severe or urgent symptoms, seek emergency care.
Sources
- Cleveland Clinic: Low Testosterone
- Cleveland Clinic: Testosterone
