What Causes Low Testosterone?

Aug 25, 2025

Testosterone is a crucial hormone for both men and women, although it’s most commonly associated with male health. It plays a key role in energy levels, muscle mass, mood, libido, and hair growth. When testosterone levels drop, the effects can be felt across the body. But what exactly causes low testosterone—and how do you know if it’s affecting you?

In this blog, we’ll explore the reasons behind low testosterone, its connection to fatigue, stress, and hair loss, and what signs may indicate it’s time to speak with a doctor.

Understanding Testosterone

Testosterone is a hormone produced primarily in the testes in men and in smaller amounts in the ovaries and adrenal glands in women. It regulates many essential functions including:

  • Muscle and bone strength
  • Sex drive and reproductive health
  • Red blood cell production
  • Energy and motivation
  • Hair growth

As we age, it’s normal for testosterone levels to decline gradually. But in some cases, the drop is more significant—and leads to symptoms that interfere with daily life.

Can Low Testosterone Cause Fatigue?

Yes. One of the most common symptoms of low testosterone is fatigue that doesn’t improve with rest. People often search:

  • Can low testosterone cause fatigue?
  • Does low testosterone make you tired?
  • Why does low testosterone cause fatigue?
  • Will low testosterone make you tired?

Low testosterone affects energy production in the body and may also impact sleep quality and mood—both of which can worsen overall tiredness. If you feel drained despite good sleep and nutrition, hormone levels may be worth investigating.

Other Symptoms of Low Testosterone

Aside from low testosterone fatigue, other signs may include:

  • Reduced libido
  • Mood changes (irritability, depression)
  • Difficulty building or maintaining muscle
  • Increased body fat
  • Trouble concentrating
  • Hair thinning or loss

If you’re noticing a combination of these symptoms, it might be time to ask your provider to check your hormone levels.

Causes of Low Testosterone

There isn’t a single cause of low testosterone. Some of the most common include:

1. Age

Testosterone declines naturally with age—especially after 30. This is often gradual, but in some individuals the drop can be more pronounced.

2. Chronic Illness

Conditions like obesity, diabetes, and sleep apnea have been linked to lower testosterone levels.

3. Stress

Yes—stress can lower testosterone. Chronic stress increases cortisol (the stress hormone), which may suppress testosterone production.

People frequently search:

  • Can stress cause low testosterone?
  • Does stress lower testosterone?
  • Can stress affect testosterone?
  • Does stress increase testosterone in females?

While brief stress may temporarily raise levels in some cases, long-term emotional or physical stress tends to decrease testosterone—especially in men.

4. Medications or Medical Treatments

Certain medications (like opioids or steroids), chemotherapy, and radiation can interfere with testosterone production.

5. Injuries or Hormonal Disorders

Injuries to the testicles or problems with the hypothalamus or pituitary gland can also disrupt testosterone levels.

Hair Loss and Testosterone

Another common concern linked to hormones: hair loss. People often associate testosterone with balding, but the truth is more nuanced.

Here’s what you might be wondering:

  • Does testosterone cause hair loss?
  • Can low testosterone cause hair loss?
  • Is balding a sign of low testosterone?
  • Low testosterone and hair loss—what’s the connection?

High vs. Low Testosterone and Hair Loss

  • High levels of DHT (a byproduct of testosterone) are linked to male pattern baldness—especially if you’re genetically predisposed.
  • Low testosterone, on the other hand, may lead to hair thinning in other areas of the body (like arms, legs, or beard), and potentially scalp hair loss as well.

Search terms like:

  • Hair thinning testosterone
  • Balding low testosterone
  • Low T and hair loss
  • Does low testosterone cause baldness?

…reflect how many people experience hair changes when their hormones are out of balance. Whether the cause is high DHT or low testosterone levels, testing can help clarify the source.

Libido and Sexual Health

Testosterone plays a direct role in sex drive and function. A drop in libido is one of the most recognized signs of low T.

If you’ve searched:

  • Low testosterone sex drive
  • Signs of low testosterone in men or women
  • Can lack of testosterone affect desire?

—know that hormone levels influence not only interest in intimacy, but also physical arousal, stamina, and satisfaction.

Is It Time to See a Specialist?

If you’re experiencing unexplained fatigue, hair loss, mood changes, or weight shifts, you might benefit from seeing a hormone specialist or endocrinologist. Search trends like:

  • Signs you need to see an endocrinologist
  • What doctor checks hormone levels?
  • Hormone health specialist

…reflect the growing awareness around hormonal health and its impact on daily life. Blood tests can confirm whether testosterone—or other hormone levels—are contributing to your symptoms.

Low testosterone isn’t just about aging—it can affect your energy, hair, mood, and motivation. If you’ve been feeling off and can’t pinpoint why, it might be time to look deeper. Getting answers about your hormones can be the first step toward feeling more like yourself again.

What Causes Low Testosterone?

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