Can Anabolic Steroid Use Cause Infertility? Hormonal Balance and the Recovery Process

In gyms and bodybuilding circles, the use of external testosterone or anabolic steroids to increase muscle mass and performance is more common than is often assumed. While the effects of these substances on muscle are widely discussed, their effects on reproductive health frequently go unnoticed. Yet male hormone taken from outside can markedly suppress the body's own hormone production and, with it, sperm production.

This article covers, without judgement, the effects of steroids on hormonal balance and fertility, recovery after stopping, assessment and the treatment approach.

Why does external hormone suppress sperm production?

In men, hormone and sperm production are governed by a communication system between the brain and the testicles. This system is called the hypothalamic–pituitary–testicular axis. The hypothalamus in the brain sends a signal to the pituitary gland, and the pituitary releases two important hormones into the blood: LH and FSH. LH prompts the testicle to produce testosterone, while FSH directs the sperm-producing cells inside the testicle.

The system works like a thermostat: when blood testosterone rises, the brain reduces the release of LH and FSH. When testosterone or anabolic steroids are taken from outside, the level of male hormone in the blood stays high; the brain then turns down the signal to the testicles and may shut it off almost entirely.

There is an important detail here: sperm production requires the testosterone level inside the testicle to be far higher than the level in the blood. Although external hormone raises the blood level, it cannot provide this high level within the testicle. As the signal falls, the testicle stops producing its own testosterone and sperm production slows or stops. In other words, while more hormone reaches the muscles, the testicle's "fuel" runs low.

What problems can steroid use cause?

The severity of effects varies with the substance, duration and individual. Common consequences include:

Reduced sperm count and azoospermia: The sperm count can fall markedly; in some men no sperm at all may be found in the semen, a condition known as azoospermia.
Testicular shrinkage: Testicular tissue that receives no stimulation shrinks and may become softer.
Libido and erection problems: Sexual desire may fluctuate during use. The main difficulty often appears after stopping; because the body's own production has not yet recovered, low sexual desire and difficulty with erections can occur.
Gynaecomastia (breast enlargement): Part of the male hormone taken into the body can be converted into female hormone in the tissues, causing breast tissue enlargement and tenderness.
Changes in mood: Irritability and impulsiveness may be seen during use, and low motivation, tiredness and low mood during the period after stopping.

What happens between cycles and after stopping?

Stopping use, or taking a break between cycles, does not mean the axis immediately returns to its previous state. Once the external hormone has cleared from the body, it takes time for the brain to restart the LH and FSH signal and for the testicle to respond to it. During this interval the testosterone level may fall below normal; fatigue, low sexual desire, difficulty with erections and fluctuating mood are common complaints at this stage.

The recovery of sperm production is a separate process. The maturation of sperm cells is itself a cycle lasting several months, so even when hormone levels begin to improve, improvement in the semen analysis is seen later. The recovery period varies considerably from person to person: in most men improvement is expected over a matter of months, but with long-term, high-intensity or repeated use this period may be longer. In some men sufficient recovery may not occur on its own, so the process should be monitored with tests.

An important note for men using testosterone on medical advice

The fertility-suppressing effect of external testosterone is not specific to use for sport. The same mechanism operates in men receiving testosterone therapy on medical advice for testosterone deficiency: the brain reduces the release of LH and FSH, and sperm production may fall.

So although testosterone therapy is a suitable option for testosterone deficiency, it is not a fertility treatment. It is important for men planning to have a child in the near future to share this wish with their doctor before treatment begins. Those already on treatment who are planning a child should make a plan with their doctor rather than stopping the medicine on their own initiative.

How is the assessment carried out?

The main aim of assessment is to establish how far the axis has been suppressed and the state of sperm production. Information shared during the consultation is handled in confidence.

History: The type of substances used, the duration and pattern of use, the time of last use, any previous breaks between cycles, accompanying complaints and plans for having children are all asked about.
Physical examination: The size and consistency of the testicles, the breast tissue and general findings are assessed.
Hormone tests: Testosterone, LH, FSH and, where needed, other hormones are measured to determine the state of the axis. The timing of the tests is interpreted according to how long it has been since last use.
Semen analysis: Sperm count, motility and morphology are examined. Where necessary, the analysis is repeated at intervals to follow recovery.
Ultrasound and additional tests: A testicular ultrasound is performed where needed; a blood count, liver tests and blood fats may also be added to the assessment.

What is the treatment approach?

Treatment is determined individually according to the person's hormone values, the semen analysis result and plans for children. The general approach includes the following steps:

Stopping use: The first and fundamental step towards recovery is ending the intake of external hormone.
Monitoring: In some men the axis recovers on its own; the process is followed by repeating hormone tests and semen analysis at intervals.
Treatments aimed at restimulating hormone production: Where recovery is slow or the wish for a child is pressing, treatments aimed at restarting the brain's and the testicle's own production can be planned under medical supervision. The choice and duration are tailored to the individual.
Surgical sperm retrieval: If azoospermia persists despite an adequate period and treatment, methods of retrieving sperm from testicular tissue may be considered. The sperm are used in IVF (microinjection, ICSI).
Sperm freezing: Where sperm are found in the semen, particularly if the course is uncertain, freezing and storing sperm can be considered as a precaution for the future.

Why is a self-directed "recovery protocol" risky?

"Recovery" programmes picked up from the internet or from others carry a number of risks when applied without medical assessment:

Measures taken without measuring hormone values can mask the true state of the axis and make it harder to follow recovery properly.
Medicines used without supervision can cause unexpected side effects and new disturbances in hormonal balance.
The content of products of uncertain origin cannot be verified.
Because no semen analysis is carried out, an important condition such as azoospermia can go unnoticed and time may be lost.

When should a doctor be consulted?

A urology and andrology assessment is advised in the following situations:

Planning to have a child after using anabolic steroids or testosterone
No conception within a year of regular, unprotected intercourse
Noticing marked shrinkage or softening of the testicles
Prolonged low sexual desire, difficulty with erections or fatigue after stopping
Enlargement, pain or tenderness of the breast tissue
Planning to have a child while receiving testosterone therapy on medical advice

External testosterone and anabolic steroids can reduce sperm production by suppressing the hormonal signal from the brain to the testicles; testicular shrinkage, problems with sexual function and gynaecomastia may accompany this picture. Recovery after stopping is possible for most men, but its duration varies from person to person and may be longer after prolonged use. Assoc. Prof. Zülfü Sertkaya practises in urology and andrology in Istanbul; assessment and treatment planning for hormonal and fertility problems related to anabolic steroid use are carried out with individual assessment and confidentiality.

Frequently Asked Questions

Does sperm production return after stopping steroids?

In most men, once use has stopped, the hormonal signal between the brain and the testicles starts working again and sperm production recovers over time. The pace of this process varies from person to person, however, and improvement may come later after long-term use. Whether recovery has actually taken place is established with hormone tests and repeated semen analyses.

Is taking a break between cycles enough to protect fertility?

Short breaks are often not enough for the suppressed hormonal axis to recover fully. Because sperm cell maturation is a cycle lasting months, improvement in sperm count may lag behind even when hormone values have normalised. Rather than assuming fertility is preserved during a break, the situation should be assessed with tests.

Can testosterone therapy prescribed by a doctor also cause infertility?

Treatment given for testosterone deficiency can also lower sperm production by reducing the brain's release of LH and FSH. This does not mean the treatment is inappropriate, but men planning a child in the near future should discuss it with their doctor. Rather than being stopped on one's own initiative, the treatment should be replanned together with the doctor.

Is fatherhood possible if no sperm are found in the semen?

In a considerable proportion of azoospermia related to steroid use, sperm may reappear in the semen after use has stopped and, where needed, treatments that stimulate hormone production have been given. If sperm are still not found despite these approaches, testicular sperm retrieval and IVF may be considered. The route to follow is planned at the level of the couple, together with the female partner's assessment.

Medical Disclaimer: The content on this page is for general information only and does not replace a physician's examination. Always consult a doctor for a personal diagnosis and treatment.