High testosterone means your blood levels of this hormone exceed the typical range for your sex and age. For most adult men, the normal range falls between roughly 300 and 1,000 ng/dL, so levels consistently above that upper boundary are considered high. For women, normal testosterone is much lower, generally between 15 and 70 ng/dL, and even modest elevations can cause noticeable symptoms. What “high” looks like, what causes it, and what it does to your body differs significantly between men and women.
How Testosterone Is Measured
A standard testosterone blood test measures total testosterone, which includes both the hormone floating freely in your bloodstream and the portion bound to proteins. Most of your testosterone is attached to a protein called sex-hormone-binding globulin (SHBG), and in that form your body can’t easily use it. Free testosterone, the unbound portion, is what actually drives effects like muscle growth and hair development. A total testosterone test is the most common starting point, but if results seem off or don’t match your symptoms, your doctor may order a free testosterone test to get a clearer picture.
Timing matters. Testosterone peaks in the early morning and drops throughout the day, so blood draws are typically scheduled in the morning to capture your highest levels. A single high reading doesn’t necessarily mean you have a problem. Guidelines from the Endocrine Society recommend confirming any abnormal result by repeating the test on a separate morning, ideally while fasting.
Signs of High Testosterone in Men
Naturally occurring high testosterone in men who aren’t using hormones or supplements is uncommon. Most of what’s known about the effects of very high levels comes from men using anabolic steroids or supplemental testosterone to boost athletic performance or change their appearance. In those cases, pushing testosterone well above normal can trigger a recognizable pattern of side effects.
Common signs include severe or persistent acne, particularly on the back and shoulders. Mood changes are frequent: increased irritability, aggression, and impulsivity. Sleep problems, including sleep apnea, can develop or worsen. The body may overproduce red blood cells, a condition called erythrocytosis, which thickens the blood and raises the risk of clots. Paradoxically, very high testosterone can also shrink the testicles and reduce sperm production, because the body’s feedback system shuts down its own natural hormone output when it detects an external surplus. Over time, chronically elevated levels are linked to liver damage and cardiovascular strain.
Signs of High Testosterone in Women
Women are far more sensitive to testosterone shifts, so even a small increase above the normal range can produce visible changes. The most recognizable symptom is hirsutism: coarse, dark hair growing in places like the upper lip, chin, chest, abdomen, and back. This isn’t the fine “peach fuzz” most women have. Clinicians sometimes use a tool called the modified Ferriman-Gallwey scoring system, which rates hair growth across nine body areas on a scale from 0 to 4. A combined score above 8 points toward a genuine hormone-driven pattern rather than normal variation.
Other common signs include persistent acne and oily skin that doesn’t respond well to typical treatments, irregular or absent menstrual periods, thinning hair on the scalp in a pattern similar to male baldness, and difficulty getting pregnant. In more extreme cases, particularly in conditions present from birth, the clitoris may become noticeably enlarged. Doctors also look for secondary clues of the metabolic problems that often accompany high testosterone in women, including weight gain concentrated around the midsection, skin tags, and darkened patches of skin on the neck or underarms (a sign of insulin resistance).
What Causes High Testosterone
The causes differ sharply between men and women.
In Women
The most common cause by far is polycystic ovary syndrome (PCOS), a hormonal condition affecting 6% to 10% of premenopausal women. In PCOS, the ovaries produce excess testosterone, which drives many of the condition’s hallmark symptoms: irregular periods, acne, hirsutism, and weight gain. PCOS is also closely tied to insulin resistance, which can further amplify testosterone production.
Less common causes include congenital adrenal hyperplasia (CAH), a genetic condition where the adrenal glands can’t produce enough of the stress hormone cortisol. To compensate, they overproduce testosterone and other related hormones instead. Rarely, tumors on the ovaries or adrenal glands can directly secrete testosterone, sometimes causing levels to spike dramatically.
In Men
The overwhelmingly common cause of very high testosterone in men is external use of anabolic steroids, testosterone injections, or related hormones. Natural overproduction is rare but can occur with testosterone-secreting tumors of the testes or adrenal glands, or with CAH. Overuse of prescribed testosterone replacement therapy can also push levels above the intended range if dosing isn’t carefully monitored.
How High Testosterone Affects Long-Term Health
For women with PCOS, chronically elevated testosterone isn’t just a cosmetic concern. It’s associated with a higher risk of type 2 diabetes, cardiovascular disease, and endometrial problems linked to prolonged irregular periods. Insulin resistance, which is both a cause and a consequence of the hormonal imbalance, tends to worsen over time without management.
For men using supraphysiologic doses of testosterone (levels far above what the body would produce naturally), the risks accumulate with duration. Thickened blood from excess red blood cell production increases the chance of stroke or deep vein clots. Liver stress can progress to more serious damage. The heart muscle may enlarge, raising the risk of heart failure. Fertility often drops significantly because the body’s own testosterone production shuts down, and recovery after stopping steroid use can take months or longer.
How It’s Diagnosed and Evaluated
Diagnosis starts with a morning blood draw for total testosterone levels. If those come back high, your doctor will typically repeat the test to confirm. From there, additional bloodwork helps narrow down the cause. This often includes checking levels of related hormones like DHEA-S (produced by the adrenal glands), free testosterone, and markers of insulin resistance like fasting glucose.
For women showing physical signs of excess testosterone, doctors assess the degree of hirsutism, the type and severity of acne (comedonal, inflammatory, or mixed), and where on the body symptoms are concentrated. These physical findings, combined with blood results, help distinguish PCOS from rarer causes like adrenal disorders or tumors. In some cases, imaging of the ovaries or adrenal glands is needed to rule out structural problems.
Managing High Testosterone
Treatment depends entirely on the underlying cause. For women with PCOS, the approach usually combines lifestyle changes with medication. Weight loss of even 5% to 10% of body weight can meaningfully lower testosterone and improve insulin sensitivity. Hormonal contraceptives are commonly prescribed to regulate periods and reduce testosterone’s effects on skin and hair. Anti-androgen medications can help with hirsutism and acne, though hair growth changes take several months to become noticeable because of how slowly hair follicles cycle.
For men whose levels are high due to steroid use, stopping the external source is the primary step, though recovery of natural hormone production can be slow and sometimes requires medical support. When a tumor is responsible, surgical removal typically resolves the hormone excess. For CAH, treatment focuses on replacing the missing cortisol, which in turn signals the adrenal glands to stop overproducing testosterone.
Regardless of the cause, managing high testosterone is a process rather than a quick fix. Physical symptoms like excess hair growth or acne improve gradually over weeks to months, and ongoing monitoring ensures levels stay within a healthy range after treatment begins.