Male hormonal health: hormones, symptoms and blood values

Male hormonal health is about far more than testosterone alone. Your hormones drive your energy, libido, muscle mass, bones and mood. From age 30, testosterone declines gradually by roughly 1 to 2 percent per year, but for many men lifestyle matters more than age. This page explains which hormones count, how to spot an imbalance, and which blood values actually give clarity.

One thing first. Symptoms alone tell you little; blood values tell you the story.

Which hormones determine male health?

The main male hormones are testosterone, free testosterone, SHBG, LH, FSH, oestradiol and cortisol. Testosterone drives libido, muscle and energy. SHBG binds testosterone and sets how much is freely available. LH and FSH come from the brain and drive production. Together they form a feedback system.

A short summary per hormone:

• Total testosterone: the main hormone for libido, strength, muscle and mental drive. Most of it is bound and inactive.
• Free testosterone: the small, biologically active fraction (about 1 to 3 percent). This is the form your tissues actually use.
• SHBG (sex hormone-binding globulin): the protein that binds testosterone. High SHBG can make a normal total testosterone clinically low.
• LH (luteinising hormone): the signal from your pituitary that tells the testes to make testosterone.
• FSH (follicle-stimulating hormone): drives sperm production together with testosterone. Mostly relevant for fertility questions.
• Oestradiol: a form of oestrogen men need too, but too much can cause symptoms. Fat tissue converts testosterone to oestradiol.
• Cortisol: your main stress hormone. Chronically high cortisol suppresses testosterone.

The feedback system: from your brain to your testes

Your testosterone production starts in your brain, not your testes. The hypothalamus releases GnRH, which prompts your pituitary to release LH. LH travels through your blood to the Leydig cells in your testes, which then make testosterone. When testosterone is high enough, your body signals back and the drive eases off.

This is why LH is so telling. It shows whether low testosterone comes from your brain or your testes, and that difference decides which approach makes sense.

You do not need to memorise these names. The point is that one marker without the others can mislead you.

How do you recognise a hormonal imbalance?

A hormonal imbalance in men rarely shows as a single symptom. More often you see a combination: persistent fatigue, lower libido, muscle-mass loss, abdominal-fat gain, irritability and poor sleep. One or two symptoms say little. Three or more lasting longer than six weeks deserve clarification through blood work.

The symptoms usually fall into four groups:

• Physical: fatigue, reduced strength, abdominal-fat gain, muscle-mass loss, sometimes hot flushes.
• Sexual: lower sex drive, fewer spontaneous morning erections, gradually worsening erectile dysfunction and hormones.
• Mental: irritability, low mood, reduced concentration and motivation.
• Sleep: difficulty falling asleep, restless sleep, waking unrefreshed.

How common is this? In about 2 in 100 men aged 40 to 79, these symptoms are linked to lab-confirmed low testosterone (Wu et al., 2010). Picture a 45-year-old who has felt flat for months, sleeps worse and has less interest in sex. For him, the combination of symptoms plus blood values says more than any single number.

Important: these symptoms also fit stress, sleep deprivation, thyroid problems or iron deficiency. That is why blood work is needed to separate the hormonal track from other causes.

How do your hormones change over the years?

In men, testosterone declines gradually from around age 30, by 1 to 2 percent per year (Travison et al., 2007). This is much slower than the female menopause, with large individual variation. Most men notice little until their 50s. Symptoms that affect daily life often appear between 50 and 70.

Age is not the only driver. A healthy 60-year-old sometimes has higher values than a stressed 35-year-old with excess weight and poor sleep. Sleep, weight, training, stress and alcohol each have their own measurable effect.

What can speed up the decline is well studied: excess weight, chronic sleep loss, heavy alcohol use and prolonged stress. A man who loses abdominal fat often sees a measurable rise in free testosterone, because fat tissue converts less testosterone to oestradiol. You cannot change your age, but you can change these factors.

That is why a baseline measurement around age 40 makes sense. A measurement in a symptom-free period gives you a personal reference point. If symptoms appear later, you know how far your values have shifted from your own normal. For the early phase, see our piece on penopause and the male transition.

Which blood values give insight into your hormones?

Five markers tell the story together: total testosterone, free testosterone, SHBG, LH and FSH. Low testosterone with low LH points to a central brain-signal problem. Low testosterone with high LH points more to the testes. A normal total testosterone with high SHBG can still cause symptoms, because too little free testosterone remains.

The five core markers with their typical adult-male reference ranges:

• Total testosterone: typically 10 to 35 nmol/L. Always sample in the morning, when testosterone is highest.
• Free testosterone: about 0.225 to 0.725 nmol/L. The biologically active fraction.
• SHBG: about 18 to 54 nmol/L. High SHBG can make a normal total testosterone low in practice.
• LH: about 1.5 to 9.3 IU/L. Indicates whether your brain is signalling testosterone production.
• FSH: about 1.4 to 18.1 IU/L. Mostly relevant for fertility questions.

The interpretation in four common patterns:

• Low testosterone and low LH: the brain signal is reduced. Often fits stress, sleep deprivation, excess weight or medication. Responds best to lifestyle.
• Low testosterone and high LH: the testes respond inadequately. This may point to primary hypogonadism and warrants medical evaluation.
• Normal testosterone, high SHBG and symptoms: too little free testosterone remains. Measuring free testosterone or SHBG is the key here.
• Normal testosterone, normal SHBG and symptoms: the cause likely lies elsewhere. Consider thyroid, iron, cortisol or sleep.

Two practical points. Always measure in the morning before 10 a.m., because testosterone follows a daily rhythm and peaks then. And confirm an abnormal value with a second measurement, because a single result can swing due to sleep, illness or stress on the test day.

To map these five markers in one go, the Hormones Man test covers them all, including free testosterone. For a broader view with thyroid and metabolism, see the Men 40+ Panel. If you only want to track testosterone, a focused testosterone panel often suffices.

Common hormonal themes in men

Hormonal symptoms come in a few recognisable forms. Below are the main themes, each with an article that goes deeper. Think of this as the directory for the cluster.

Understanding and optimising testosterone

Testosterone is the most discussed male hormone, and the most misunderstood. What a normal value is, why free testosterone counts, and what lifestyle really does, you can read in our guide on understanding your testosterone levels.

Boosting testosterone naturally

Sleep, training, body composition and nutrition together shape your hormone balance. What actually works and what is a myth, you can read in boosting testosterone naturally.

Low testosterone and penopause

Penopause is not an official diagnosis, but the symptoms are real. What sets it apart from late-onset hypogonadism, and which biomarker pattern fits, we cover in penopause and the male transition.

Erectile dysfunction and hormones

Erection problems are often an early signal, not just a sexual issue. The hormonal and vascular factors, and which blood values are useful, are in erectile dysfunction and hormones.

Fertility and hormones

FSH, LH and testosterone drive your sperm production together. What every man can know about the hormonal side of fertility is in male fertility.

Men's health after 40

After 40, more changes than testosterone alone. Which tests give a broader view of hormones, heart and metabolism, we discuss in men's health after 40.

Prostate and PSA

The prostate is linked to your hormonal health and becomes more relevant with age. What PSA does and does not tell you is in prostate health.

What can you do yourself for your hormone balance?

Lifestyle has more impact on testosterone than age alone for many men. The four interventions with the strongest evidence are sleep, resistance training, body composition and stress reduction. None is a miracle cure, but together they can make a noticeable difference.

• Sleep 7 to 9 hours per night: at 5 hours, testosterone can drop 10 to 15 percent within a week (Leproult and Van Cauter, 2011).
• Resistance training with compound movements: squats, deadlifts and bench press at 70 to 85 percent of 1RM, 3 to 5 times per week.
• Keep body-fat between 12 and 20 percent: too much abdominal fat can convert testosterone to oestradiol, while too little fat can suppress production.
• Limit chronic stress: high cortisol can suppress testosterone via the stress axis. Walking, breathing exercises and recovery time help.
• Limit alcohol: heavy regular drinking is associated with lower testosterone.

The good part is that these factors reinforce each other. Better sleep lowers your cortisol, lower cortisol makes training more effective, and more effective training improves your body composition. You do not have to do everything perfectly at once. Building one habit at a time works better than a radical overhaul you drop after two weeks.

Over-the-counter testosterone boosters show no clinically relevant effect in healthy men in well-designed trials. Vitamin D and zinc may help, but mostly if your values are already low. Measure first, supplement second.

When should you see your GP?

Make an appointment if you recognise three or more typical symptoms lasting longer than six weeks that affect your daily life. Also with sudden erectile dysfunction or blood values outside the reference range: do not wait. Your GP can rule out other causes and refer you if needed.

What to bring to the consultation:

• A list of your symptoms with start date and intensity.
• Recent blood results, ideally a morning measurement of testosterone, SHBG, LH and FSH.
• An overview of your medications and supplements. Some drugs can suppress testosterone.
• Notes on sleep, alcohol, weight and stress.

Testosterone replacement therapy (TRT) is a serious, lifelong intervention and not a first-line solution for age-related symptoms. According to the Endocrine Society guideline (Bhasin et al., 2018), TRT only enters the picture with repeatedly measured low testosterone combined with matching symptoms.

Frequently asked questions

Which blood test measures male hormones best?

A reliable baseline needs a venous morning measurement of total testosterone, free testosterone, SHBG, LH and FSH. The Hormones Man test covers these markers. Finger-prick and saliva tests give an indication but are less reliable than a venous draw in an accredited lab. Sample before 10 a.m. where possible.

At what age should I check my hormones?

There is no fixed age, but a baseline around 40 makes sense for many men. If you have earlier symptoms such as persistent fatigue, low libido or erection problems, testing at any point is reasonable. A measurement in a symptom-free period gives you a personal reference point for later.

Can stress lower my testosterone?

Yes, chronic stress can lower testosterone. Prolonged high cortisol suppresses the brain signal that drives your testes, reducing production. This is one reason sleep and stress reduction matter as much as training and nutrition for your hormone balance.

Is low testosterone always a problem?

Not always. A low value without symptoms calls for a different judgment than symptoms with a low value. Only when a repeatedly measured low testosterone occurs together with matching symptoms do doctors call it a treatable condition. Always discuss your result in the context of your symptoms with a doctor.

Getting started

Want to know where you stand? A baseline measurement of your hormones is the most concrete first step. The Hormones Man test maps your five core markers, so you can go into the conversation with your GP well informed.

References

1. Travison TG et al. A population-level decline in serum testosterone levels in American men. Journal of Clinical Endocrinology and Metabolism. 2007;92(1):196-202. PMID: 17062768.
2. Wu FCW et al. Identification of late-onset hypogonadism in middle-aged and elderly men. New England Journal of Medicine. 2010;363(2):123-135. PMID: 20571035.
3. Bhasin S et al. Testosterone therapy in men with hypogonadism: an Endocrine Society clinical practice guideline. Journal of Clinical Endocrinology and Metabolism. 2018;103(5):1715-1744. PMID: 29562364.
4. Leproult R, Van Cauter E. Effect of 1 week of sleep restriction on testosterone levels in young healthy men. JAMA. 2011;305(21):2173-2174. PMID: 21632481.
5. EAU Guidelines on Sexual and Reproductive Health. European Association of Urology. 2024.

Disclaimer

Caliberhealth works with BIG-registered doctors who review your blood results. This article provides general information and is not a substitute for medical advice from a GP or specialist. A blood test is a tool to inform your conversation with your doctor, not a diagnosis on its own. For severe symptoms or concerns about your health: contact your GP, or call 112 in an emergency.