High testosterone can increase muscle growth, sex drive and androgen-related traits, but unusually high levels can also cause acne, hair loss, high blood pressure, excess red blood cells, mood changes, reduced sperm production, testicular shrinkage and infertility. These effects are most often linked to testosterone therapy, anabolic steroids or other hormone products. Naturally high testosterone may cause few obvious symptoms and can sometimes point to an underlying medical problem.
Reviewed:
One abnormal blood test does not explain why testosterone is high. Doctors interpret the result alongside symptoms, age, medication and supplement use, the laboratory's reference range and other hormone tests.
High Testosterone in Men: Effects at a Glance
| Body system | Possible effect of unusually high testosterone |
|---|---|
| Muscles | Increased muscle size and strength, especially with anabolic steroid doses |
| Skin and hair | Acne, oily skin and faster scalp hair loss in men prone to baldness |
| Sexual function | Increased sex drive in some men, although erectile dysfunction can also occur |
| Fertility | Lower sperm count, infertility and smaller testicles |
| Blood and circulation | Higher red blood cell count, high blood pressure and a possible increase in clot risk |
| Mood | Irritability, mood swings, aggression or manic symptoms, especially with steroid misuse |
| Breasts | Breast enlargement, partly because some testosterone converts to estrogen |
| Sleep and prostate | Worsened sleep apnea, prostate enlargement and urinary symptoms |
These effects are more strongly associated with excessive doses or non-medical use than with naturally high testosterone that remains within the laboratory's reference range.
Can High Testosterone Increase Muscle and Sex Drive?
Yes, high testosterone can increase muscle growth and sex drive in some men, particularly when levels rise above a person's usual range.
Testosterone supports muscle mass, strength, bone density, facial and body hair growth, sex drive and red blood cell production. Raising testosterone above the body's normal level can increase muscle growth, especially when anabolic steroids are involved. It does not guarantee better sexual function or better health.
High-dose testosterone can also raise the amount of testosterone in the bloodstream while lowering the body's own production. That distinction matters because blood testosterone and testicular testosterone production are not the same thing.
What Are the Physical Signs of High Testosterone?
Physical signs can affect the skin, hair, chest, muscles and testicles. Possible changes include:
- Severe or persistent acne
- Oily skin
- Faster scalp hair loss in men who are genetically prone to baldness
- Increased muscle size
- Breast enlargement
- Testicular shrinkage
- Fluid retention
- A raised red blood cell count
- High blood pressure
High blood pressure may cause no obvious symptoms. Testosterone therapy can also stimulate prostate growth, worsen urinary symptoms and aggravate obstructive sleep apnea in some men.
These signs do not prove that testosterone is high. Acne, hair loss, fertility problems and changes in blood pressure can have other causes, so a blood test and medical review are needed.
Can High Testosterone Affect Mood and Behavior?
Yes, high-dose anabolic steroid use can affect mood and behavior. Reported effects include irritability, mood swings, aggressive behavior, paranoia and manic symptoms.
These problems are linked mainly to steroid misuse or testosterone levels above the body's usual range. A naturally high testosterone result does not prove that a man will be aggressive or have anger problems.
Does High Testosterone Cause Infertility?
Yes. High-dose testosterone can reduce fertility, even when it increases muscle mass or sex drive.
External testosterone suppresses the hormones that stimulate the testicles to produce sperm. This can result in:
- A low sperm count
- Temporary or prolonged infertility
- Smaller testicles
- Lower natural testosterone production
- Erectile dysfunction in some men
The Endocrine Society recommends against testosterone therapy for men who are planning fertility in the near term. Men who take testosterone and want children should discuss alternatives with an endocrinologist or urologist instead of stopping treatment without medical advice.
What Causes High Testosterone in a Man?
The main causes are:
- Testosterone replacement therapy, especially when the dose is too high.
- Anabolic steroid use for bodybuilding or athletic performance.
- Testicular tumors, which can produce excess testosterone.
- Adrenal gland disorders, including congenital adrenal hyperplasia.
- Unregulated bodybuilding or "testosterone booster" products that contain steroids or steroid-like substances.
A single high result cannot identify the cause. A clinician may consider the timing of the test, symptoms, medications, supplements and other hormone results before deciding whether more testing is needed.
Is Naturally High Testosterone Healthy?
Not necessarily. Testosterone is useful at an appropriate level, but a persistently high result is not automatically a sign of better health, greater masculinity or higher fertility.
A mildly high result may cause no symptoms. A substantially elevated or repeated result deserves medical evaluation because it may be related to hormone treatment, steroid use or, less commonly, a testicular or adrenal condition.
When Should a Man See a Doctor?
See a doctor if a blood test shows high testosterone or if you develop unexplained acne, breast enlargement, testicular shrinkage, infertility, mood changes, high blood pressure or symptoms of sleep apnea.
Seek urgent medical help for chest pain, difficulty breathing, one-sided leg pain or swelling, sudden severe mood changes, or an erection that is painful or lasts unusually long. These symptoms can signal serious complications associated with testosterone medicines or steroid use.
Bottom Line
A high testosterone result is a finding, not a diagnosis. The next step is to identify why the level is high and whether treatment, steroid use, supplements or a testicular or adrenal condition is involved. High testosterone may increase muscle growth and sex drive, but it can also harm fertility and affect the blood, skin, mood, prostate and sleep.