Testosterone – myths, facts and what you actually need to know

Many people hear the word testosterone and immediately think of muscles, sex drive or “masculinity”. In social media and advertising, testosterone is often presented as a quick explanation for fatigue, lower energy, depression or reduced desire. But the reality is more nuanced than that.

Testosterone is an important hormone, but it is not a universal solution to all problems in men. At the same time, it is also not true that testosterone treatment is always dangerous or “cheating”. The important thing is to separate myths from medical facts – and to understand when symptoms may actually be due to testosterone deficiency and when other causes are more likely. A medical assessment is based on both symptoms and blood tests, not on gut feeling or single values.

Myth 1: “Low testosterone is the common cause of fatigue and low sex drive”

This is one of the most common misconceptions.

Fatigue, decreased sex drive, poor initiative and depression can occur with testosterone deficiency, but the symptoms are nonspecific. This means that they are also common in many other conditions, for example:

• stress and fatigue
• sleep deprivation
• depression or anxiety
• overweight and obesity
• obstructive sleep apnea
• diabetes or other chronic disease
• drug side effects
• alcohol overconsumption

The symptoms that more clearly raise suspicion of testosterone deficiency are, for example:

• decreased sex drive over time
• fewer spontaneous morning erections
• erectile problems in combination with other symptoms
• infertility
• decreased beard growth or body hair
• decreased muscle mass and increased fat mass
• bone fragility or unexplained low bone density
• anemia without another clear explanation

A common patient question is: "I'm tired and lack energy - does this mean I have low testosterone?"
The answer is: not necessarily. Fatigue alone is not enough for a diagnosis. Testosterone deficiency is only suspected when typical symptoms coincide with repeated low testosterone values ​​in blood tests.

Myth 2: "If testosterone is low in one test, you have testosterone deficiency"

No - it's not that simple.

Testosterone naturally varies during the day and is affected by, among other things, sleep, acute illness, hard training, lack of energy and certain medications. Therefore, guidelines recommend that testosterone is primarily measured in the morning, and that a low value normally needs to be confirmed with a new test before the diagnosis can be made.

In some cases, testosterone also needs to be interpreted together with other tests, for example:

• SHBG (a transport protein that affects how much testosterone is biologically available)
• LH and FSH (hormones from the pituitary gland that help determine whether the problem is in the testicles or in the brain's hormone control)
• sometimes prolactin, albumin, TSH or other relevant tests depending on symptoms and clinical picture

It is also important to distinguish between:

• primary hypogonadism – when the testicles produce too little testosterone
• secondary hypogonadism – when the signaling from the pituitary gland or hypothalamus is insufficient

This matters because the causes and treatment can be different. A low testosterone level is not a complete diagnosis – it is the beginning of a medical investigation.

In practice, this means that you should not interpret a single sample taken late in the day, during an infection or after a period of very poor sleep as certain proof of testosterone deficiency. For a safe assessment, the right sample and the right context are needed.

Myth 3: “Testosterone deficiency is just a natural part of aging”

There is a grain of truth here, but the statement becomes wrong if it is oversimplified.

Testosterone levels tend to decline gradually with increasing age. But age in itself does not automatically mean pathological testosterone deficiency. Many older men still have levels that are adequate and do not have clear symptoms of androgen deficiency. In addition, some of the hormonal decline may be related to factors that come with aging, such as:

• increased abdominal obesity
• type 2 diabetes
• poorer sleep
• less physical activity
• more medications
• chronic diseases

That is why testosterone treatment is not recommended just because a man is older or has an age-related low-normal level without a clear, verified deficiency. The treatment is not intended or approved to only treat naturally declining hormone levels linked to normal aging.

At the same time, it is important not to dismiss everything as “just age.” A man with a clearly reduced sex drive, fewer spontaneous erections, osteoporosis, anemia or infertility may well need to be investigated – even at an older age. The decisive factor is therefore not the year of birth, but symptoms, tests and overall picture.

There is also an important preventive perspective for companies here. Reduced energy, weight gain, poor sleep and impaired recovery can sometimes reflect treatable ill health. The right health check can therefore contribute to the earlier detection of both hormonal and metabolic problems.

Myth 4: “Testosterone treatment is always dangerous” – or on the contrary, completely risk-free

Both extremes are misleading.

For men with a confirmed testosterone deficiency, treatment can be effective and improve, for example, sex drive, energy, bone health, blood counts and certain other symptoms. But the treatment should be used in the right patient, for the right indication, and followed up medically.

The risk profile has been much discussed, especially when it comes to cardiovascular disease. Here, the state of knowledge has developed. Large clinical studies have not shown any increased risk of serious cardiovascular events such as heart attack or stroke compared to placebo. At the same time, it is emphasized that caution is still required regarding, among other things, increased blood pressure and elevated blood values.

This does not mean that the treatment is risk-free. Important risks and areas of caution include:

• increased hematocrit/blood count (polycythemia), which can increase the risk of complications
• increased blood pressure
• need for monitoring PSA and prostate in the right patient groups
• worsening in untreated severe sleep apnea
• fluid retention in some cases
• skin side effects or local irritation depending on the dosage form

Therefore, follow-up with blood tests and clinical control is required after the start of treatment. Testosterone levels, blood counts and, if necessary, prostate-related parameters are monitored.

The most medically correct way to express it is:
Testosterone treatment is neither a universal health cure nor something that is always dangerous. It may be the right treatment for the right person, but the wrong treatment for someone else.

Myth 5: “More testosterone is always better – and testosterone does not affect fertility”

This is a particularly important misconception.

Many people assume that testosterone treatment improves fertility because testosterone is central to male reproduction. However, when testosterone is administered externally, as a gel, injection or other drug treatment, the body's own hormone regulation can be slowed down. This leads to reduced stimulation of the testicles and thus poorer sperm production. In practice, fertility can be significantly impaired, sometimes so much so that sperm become very few or completely absent from the semen for a period.

Men who are planning children in the near future should not be treated with exogenous testosterone without careful specialist assessment.

Common patient questions are:

• “Can I take testosterone to feel better and still try to have children?”
  The answer is often no, not without medical planning. Testosterone can lower sperm production.
• "If my testosterone is low, should I just start TRT right away?"
  No. First, you need to understand the cause, assess your fertility desires, and see if the symptoms could be due to something that can be influenced in other ways.

It is also important to know that lifestyle factors can play a big role. Obesity, especially abdominal obesity, and sleep disorders such as obstructive sleep apnea are linked to lower testosterone levels in many men. In such cases, weight loss, better sleep, and treatment of the underlying disease can contribute to improved hormone levels and symptoms.

This does not mean that lifestyle changes are always enough. But it does mean that the best solution is not always to supply hormones from outside. Sometimes you need to treat the cause first.

When should you test testosterone?

It is reasonable to consider testing if you have several symptoms that are consistent with testosterone deficiency, especially if the symptoms have been clear over time. Examples include:

• long-term decreased sex drive
• fewer spontaneous morning erections
• infertility
• decreased muscle mass or increased fat mass without a clear explanation
• bone fragility or repeated fractures
• unexplained anemia
• erectile dysfunction along with other typical symptoms

It may also be wise not to just focus on testosterone in isolation. A broader health check can provide important information about, for example, blood status, blood sugar, blood fats, thyroid, liver values and other markers that affect energy, recovery and sexual health. For some, this is more valuable than just chasing a single hormone response.

If you're already wondering if you have "low testosterone," the best next step is rarely to take a chance on supplements or treatment on your own. The safest thing to do is to find out what your values ​​actually look like – and interpret them in the right medical context.