normal testosterone levels

What Are Normal Testosterone Levels?

Testosterone is an important hormone found in all humans, but men have higher levels of it than women. While there is a wide range of “normal” testosterone levels, there are thresholds on either end of the spectrum which are deemed too low or too high. Low levels indicate a condition known as hypogonadism, and high levels might indicate a tumor or other health concern. Here is what you need to know about normal testosterone levels.

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Normal Testosterone Levels by Age

The normal range of testosterone levels by age are generally considered the following:

  • Adolescents: 300-1,200 nanograms per deciliter (ng/dL)
  • Adults: 270-1,070 ng/dL
  • Older men: 220-1,000 ng/dL

The best way to ascertain an individual’s normal testosterone level is to take multiple measurements at different times of the day. This can help provide a more accurate picture of the individual’s overall range.

Causes of Low Testosterone

The three causes of low testosterone are:

  • Undescended testicles
  • Testicular diseases
  • Injury or radiation of the testicles

Additional issues like anabolic steroids, certain medications, and chronic illnesses can affect testosterone levels, as well.

Signs and Symptoms of High Testosterone

The signs and symptoms of high testosterone often include:

  • Increased body hair
  • Spontaneous erections
  • Aggression
  • Acne

In many cases, high testosterone levels are caused by conditions like a tumor on the pituitary gland or testicular cancer. It is important to seek medical advice if you exhibit any of the signs and symptoms of high testosterone.


It is important to understand your normal testosterone levels and when to be concerned about lower or higher levels. Taking measurements at different times of the day can provide an accurate picture of the individual’s overall range. Low levels can be caused by undescended testicles, testicular diseases, or injury/radiation in the testicles. High testosterone can be caused by tumors or testicular cancer, and its symptoms include increased body hair, spontaneous erections, aggression, and acne.

Keywords: testosterone, normal testosterone levels, testosterone levels, hypogonadism, nanograms per deciliter, low testosterone, high testosterone, testicular diseases, undescended testicles.

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