High testosterone means your blood levels of the hormone exceed the typical range for your sex and age. For adult men, the normal range falls roughly between 150 and 700 ng/dL, while for adult women it’s much lower, generally between 7 and 50 ng/dL. Going above those ranges can produce noticeably different effects depending on whether you’re male or female, and the causes range from common hormonal conditions to rare tumors.
How Testosterone Is Measured
A blood test is the only way to confirm high testosterone. The most common version is a total testosterone test, which measures both the testosterone floating freely in your blood and the testosterone bound to proteins. Most of your testosterone is bound to proteins like sex-hormone-binding globulin (SHBG) and albumin, which means your body can’t readily use it. Free testosterone, the unbound form, is what’s actually available to build muscle, strengthen bones, and influence mood.
A free testosterone test is less commonly ordered but can be more revealing in certain situations. Someone with a normal total testosterone reading could still have unusually high free testosterone if their binding proteins are low. Your doctor may order one or both tests depending on your symptoms.
Signs of High Testosterone in Men
In men, moderately elevated testosterone often flies under the radar because the symptoms overlap with traits people consider normal. Persistent, severe acne on the back, shoulders, or face is one of the more visible signs. Hair loss on the scalp (male-pattern baldness) is another, even in younger men. A large genetic study found that higher free testosterone increases the odds of androgenic hair loss by about 49%.
Behavioral changes are more complicated. Research shows that men with higher testosterone tend to report more dominant and competitive behavior, and testosterone levels are measurably higher in populations like prisoners convicted of violent crimes. But context matters a great deal. Studies in which healthy men were given very high doses of testosterone, up to several times the normal amount, found no increase in aggression or anger. The relationship between testosterone and aggressive behavior depends heavily on other hormones like cortisol and brain chemicals like serotonin, which counterbalance testosterone’s effects on the emotional centers of the brain. One consistent finding: higher testosterone paired with lower cortisol is associated with more anger and reduced sensitivity to consequences.
Paradoxically, very high testosterone can lower sperm count. The body regulates sperm production through a feedback loop. When testosterone levels climb too high, particularly from external sources like anabolic steroids, the brain signals the testes to slow down their own production. This can lead to shrunken testicles and reduced fertility, which is why men using testosterone supplements sometimes struggle to conceive.
Signs of High Testosterone in Women
Women are more sensitive to shifts in testosterone, so even modest elevations produce noticeable changes. The most common signs include excess hair growth on the face, chest, or back (a condition called hirsutism), thinning hair on the scalp, and stubborn acne along the jawline and chin. These symptoms develop because hair follicles and oil glands are highly responsive to androgens.
Menstrual irregularity is another hallmark. Elevated testosterone lengthens the first half of the menstrual cycle (the follicular phase) and increases the likelihood of missed periods or failure to ovulate altogether. This makes high testosterone a direct contributor to fertility problems: without regular ovulation, conception becomes difficult or impossible.
Other changes can include a deeper voice, increased muscle mass, and a shift in body fat distribution toward the midsection. These changes tend to develop gradually, which means many women live with mildly elevated testosterone for months or years before seeking testing.
Common Causes
The underlying reason for high testosterone differs significantly between men and women.
In women, polycystic ovary syndrome (PCOS) accounts for 80% to 90% of all cases. PCOS is a hormonal condition in which the ovaries produce excess androgens, leading to irregular periods, ovarian cysts, and the physical symptoms described above. Diagnosing PCOS typically requires at least two of three criteria: signs of high androgens (either through blood tests or visible symptoms like hirsutism), irregular or absent ovulation, and a characteristic appearance of the ovaries on ultrasound.
Less commonly, tumors on the adrenal glands or ovaries can produce androgens directly. These cases are rare but tend to cause severe, sudden-onset symptoms rather than the gradual changes seen with PCOS.
In men, anabolic steroid use is the most frequent cause of testosterone levels well above the normal range. Testosterone replacement therapy prescribed at too high a dose can have the same effect. Adrenal or testicular tumors are possible but uncommon causes.
Long-Term Health Risks
Chronically elevated testosterone isn’t just a cosmetic or behavioral issue. A large genetic study that modeled the effects of lifelong higher testosterone exposure found several concerning associations. Men with genetically higher free testosterone had a 51% increased risk of prostate cancer and a 23% increased risk of heart attack. Their risk of high blood pressure was 17% higher than average. None of these are certainties for any individual, but they represent meaningful shifts in long-term odds.
High testosterone also raises hematocrit, the percentage of your blood made up of red blood cells. This thickens the blood and can increase the risk of clots. Men on testosterone therapy are often monitored for this with regular blood draws. The same study found that higher testosterone roughly doubled the risk of spinal stenosis, a narrowing of the spinal canal that causes back pain and nerve compression, though the mechanism behind this link isn’t fully understood.
For women, the long-term risks center on metabolic health. PCOS-related testosterone elevation is closely linked to insulin resistance, weight gain, and increased cardiovascular risk over time.
How High Testosterone Is Treated
Treatment depends entirely on the cause and on who’s affected. In men whose levels are elevated from steroid use or overly aggressive testosterone therapy, the solution is straightforward: reducing or stopping the external testosterone source. Sperm production and testicular size typically recover over time, though it can take months.
For women with PCOS, treatment targets both the hormonal imbalance and its visible effects. Combined oral contraceptives are usually the first option because they lower androgen levels and restore regular menstrual cycles. Spironolactone, a medication that blocks the effects of androgens at the tissue level, is commonly added to address hirsutism and acne. Lifestyle changes like regular exercise and maintaining a healthy weight also reduce testosterone levels in women with PCOS, partly by improving insulin sensitivity.
When a tumor is responsible, surgical removal typically resolves the hormonal excess. These cases are managed on a more urgent timeline because androgen-secreting tumors can cause rapid, severe symptoms.
High Testosterone and Fertility
The fertility impact cuts both ways. In women, high testosterone disrupts ovulation. Research has found that elevated levels significantly lengthen the follicular phase of the cycle and increase the rates of anovulation (cycles where no egg is released). Treating the underlying cause, whether through contraceptives to regulate cycles or medications that improve ovulation, often restores fertility.
In men, the picture is counterintuitive. While testosterone is essential for sperm production, too much of it, especially from external sources, actually suppresses the brain signals that drive sperm development. Studies have shown a direct relationship between the degree of testosterone suppression after treatment and improved pregnancy rates in couples dealing with male factor infertility. If you’re a man trying to conceive, this is one of the most important reasons to get tested rather than assuming higher testosterone equals better reproductive function.