Low testosterone in men: How to read the symptoms

Your belt has recently been feeling tighter, even though you haven't changed anything about your training. You're in the mood for sex less often, and you're tired in the evening even though the day wasn't particularly demanding. Maybe you've already started googling whether low testosterone is behind it before you bring it up with your GP. Completely understandable, because lower libido, more belly fat and constant tiredness often have other causes too, and in the end only a blood test brings real clarity.

In this article you'll learn which physical and psychological signs are typical, how the diagnosis works and what you can change yourself even before seeing a doctor.

Low testosterone in men: The physical symptoms

Physical signs mainly concern sexuality, muscles, fat distribution and energy (1).

Sounds like you? Then it's worth taking a closer look. But there are other possible causes too. A weaker libido can just as easily come from stress in your relationship or at work, tiredness from too little sleep or a thyroid that is currently working more slowly.

Belly fat deserves a second look. It is more than a cosmetic issue: fat tissue around the belly is hormonally active and can itself contribute to testosterone levels falling. A growing belly is therefore a sign you can take seriously, without feeling bad about it.

Sleep is similarly tricky. Poor sleep can be a consequence of low testosterone, and conversely, too little sleep also pushes levels down. We'll come back to this further below, because this is where you can take action yourself.

When your mind and mood stop playing along

Psychological signs include lack of drive, depressive moods and poor concentration (2). Some men notice it first in their drive, when things that used to be fun suddenly feel like a chore.

For others it's their mood. They get irritated more quickly, have less patience with family or colleagues and hardly recognize themselves. And still others sit in front of a task and notice that their mind simply won't stay focused.

To be honest: not every low is a hormone deficiency. Long working days, worries, too little exercise or a bad winter can trigger exactly the same feelings. And if your mood stays low for weeks, it belongs in a doctor's hands anyway, regardless of what turns out to be behind it.

If you want to learn more about exhaustion, this article might interest you: why you're constantly tired despite getting enough sleep.

A sign of aging or a hormonal disorder?

A slight decline in testosterone is part of getting older: according to the German Society of Endocrinology (DGE), levels fall by about one percent per year from age 40 (3). Other analyses give rates of between about 0.4 and 2 percent per year depending on the group studied, in some cases starting at 30. For most men, the decline is therefore somewhere around one percent, and it happens gradually, without a sharp break.

Testosterone is far more than a sex hormone. It is involved in sexual desire, muscle strength and bone health and also in concentration (3). That's why a deficiency can affect such different areas.

Still, people often talk about "male menopause." The DGE considers the term misleading, because men do not experience an abrupt hormonal upheaval like the one women go through during menopause (3). According to the DGE, the normal age-related decline usually only becomes noticeable from around 60, and even then only in some men (3).

If you are considerably younger and still have pronounced symptoms, that is a reason to look more closely. Something else may be behind it. For example, the testes produce too little testosterone, or the pituitary gland does not send enough signals to them. An underactive thyroid can also cause tiredness, weight gain and low moods that feel similar.

There is no fixed threshold at which age-related decline ends and a disorder begins. A doctor makes this assessment based on your levels, your age and your symptoms.

If you want to learn more about hormones and the environment, this article might interest you: how pollutants affect your hormonal balance.

Only a blood test brings clarity: How the diagnosis works

Only a blood test shows whether there really is a testosterone deficiency, because symptoms alone are not enough (2). That's actually good news: you don't have to guess.

Timing is important. Testosterone fluctuates over the day and is highest in the morning, which is why blood is usually drawn in the early morning. A reading from the afternoon may come out lower than your actual level.

A single low reading does not count as a deficiency yet, either. A second measurement on another morning is standard. Only when both readings are low and your symptoms fit do doctors speak of a deficiency.

By the way, different medical societies work with slightly different cut-off values. So your result is assessed in context, together with age, symptoms and sometimes other values such as free testosterone.

For the doctor's visit: One sentence is enough: "I've been feeling tired and unmotivated for a while and would like to have my hormone levels checked, including testosterone, ideally in the morning."

What really makes a difference in everyday life

Lack of sleep, excess weight, chronic stress and alcohol can push testosterone levels down, even if nothing is wrong with the hormone glands themselves. With belly fat, this works through an enzyme called aromatase, which sits in fat tissue and converts testosterone into estrogen. Some medications also play a role, for example strong painkillers from the opioid group or cortisone over a longer period. Please don't stop anything on your own; instead, talk to your doctor about it.

The good news: some of these levers are in your own hands.

Zinc is the one nutrient here with a direct link to the topic, because zinc contributes to the maintenance of normal testosterone levels in the blood. But that only means your body needs enough zinc. If you are well supplied, zinc cannot push your levels up at will. On a plant-based diet it's worth checking your intake, because substances in grains and legumes can slow absorption somewhat. Soaking or sprouting helps to some extent.

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By the way, we don't think much of products that promise you a "testosterone boost." A food supplement cannot credibly keep such promises. You can find more products around energy and resilience in the CLAV category for men.

When you shouldn't wait any longer

A medical check-up makes sense if loss of libido, erection problems or unexplained exhaustion persist for several weeks (2). Your first point of contact is your GP, and for the finer details often a urologist or andrologist (specialist in men's health).

You shouldn't wait if the symptoms start suddenly and severely. The same applies if erection problems occur together with severe tiredness, because cardiovascular issues can also be behind this.

And if you take medication regularly or are currently trying to have children, clear every step with a doctor beforehand. Testosterone products from the internet are not a shortcut, by the way; they belong exclusively in a doctor's hands.

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The next step: Observe first, then ask specifically

Knowing more about symptoms will hardly get you any further now. What helps you are your own observations. For two to three weeks, jot down briefly every evening how you slept, what your mood was like and how much energy you had. Three keywords are enough. Take these notes to your GP and ask for a morning hormone check. That way you go into the conversation with something tangible and don't have to guess anymore. And whatever the test shows: sleep, exercise and nutrition pay off in any case.

FAQ: Testosterone deficiency in men

What happens if the blood test really shows a deficiency?

Then your doctor first looks for the cause, for example in the testes, the pituitary gland, your weight or medications. Only then is it decided whether treatment is needed and which kind, with regular check-ups.

Does health insurance pay for the testosterone test?

Usually yes, if your doctor considers the test medically necessary because of your symptoms. If you have it done at your own request without a specific reason, you usually pay for it yourself.

Can I also test my testosterone level at home?

Yes, there are mail-in tests using saliva or blood from a fingertip. A morning sample matters here too. Such tests do not replace a diagnosis; an abnormal result always calls for a medical check-up.