Low Testosterone: Symptoms, Causes, Testing & Treatment
Low testosterone is more common than many people realize. Although testosterone is often associated with men, it also plays an important role in women’s health.
Low testosterone can affect energy, muscle strength, mood, libido, bone health, body composition, and overall quality of life. Fortunately, when the underlying cause is identified, it is often treatable.
At ConductMD, we evaluate testosterone as one part of the body’s interconnected hormone system rather than focusing on a single laboratory value. Testosterone rarely acts alone—it interacts with metabolism, thyroid function, cortisol, nutrition, muscle health, sleep, and other hormones.
What Is Testosterone?
Testosterone is a hormone produced primarily by the testes in men and by the ovaries and adrenal glands in women.
It helps regulate:
Muscle mass and strength
Bone density
Energy
Mood
Libido
Cognitive function
Red blood cell production
Testosterone naturally declines with age, but low levels are not always a normal part of aging.
Although laboratories provide reference ranges, results should always be interpreted alongside symptoms, age, medications, medical history, and overall health. A testosterone level within the laboratory reference range does not automatically mean it is optimal for every individual.
Symptoms of Low Testosterone in Men
Men with low testosterone may experience:
Low sex drive (low libido)
Erectile dysfunction
Fewer morning erections
Fatigue or low energy
Loss of muscle mass and strength
Increased body fat, particularly around the abdomen
Mood changes, irritability, anxiety, or depression
Brain fog and poor concentration
Reduced motivation
Decreased bone density
Poor sleep quality
Symptoms of Low Testosterone in Women
Women with low testosterone may experience:
Low libido
Fatigue and low energy
Reduced muscle strength
Mood changes
Brain fog
Increased body fat
Poor sleep
Reduced exercise performance
Decreased bone density
These symptoms are often subtle and frequently overlap with perimenopause, menopause, thyroid disorders, nutritional deficiencies, and metabolic dysfunction. A comprehensive assessment is essential before attributing symptoms to testosterone deficiency alone.
How Is Low Testosterone Diagnosed?
A diagnosis should never be based on symptoms alone or on a single blood test.
Healthcare providers consider both:
Symptoms consistent with testosterone deficiency
Persistently low testosterone levels confirmed by blood testing
A single low result is not enough to diagnose testosterone deficiency.
How Should Testosterone Be Tested?
For the most accurate results:
Blood should usually be drawn between 7:00 AM and 10:00 AM
Testing should generally be repeated on two separate mornings
Serum testosterone is the standard laboratory test
Fasting is usually not required unless other blood work is being performed
Testing should ideally be avoided during significant acute illness or immediately after major surgery, as testosterone levels may be temporarily suppressed.
Recommended Blood Tests
Your healthcare provider may recommend:
Total Testosterone
Free Testosterone
SHBG (Sex Hormone-Binding Globulin)
LH
FSH
Prolactin
TSH ± Free T4
CBC
Comprehensive Metabolic Panel
Lipid Profile
HbA1c or Fasting Glucose
PSA (when clinically indicated)
Estradiol (when clinically indicated)
Depending on your symptoms, additional testing such as ferritin, iron studies, vitamin B12, and vitamin D may also be appropriate, as nutritional deficiencies can contribute to fatigue and symptoms that mimic testosterone deficiency.
These investigations help identify the underlying cause rather than simply confirming a low testosterone level.
What Causes Low Testosterone?
Low testosterone can result from many different conditions, including:
Aging
Obesity
Insulin resistance
Poor sleep or sleep apnea
Chronic stress
Pituitary disorders
Testicular disease
Ovarian hormone changes
Certain medications
Chronic medical conditions
Excess body fat, particularly abdominal obesity and insulin resistance, are among the most common reversible contributors to lower testosterone levels.
Treatment Depends on the Cause
Treatment should always focus on addressing the underlying cause whenever possible.
For many individuals, improving lifestyle factors can significantly improve testosterone levels and symptoms. Weight loss in people living with obesity, resistance training, adequate sleep, treatment of sleep apnea when present, balanced nutrition, reducing excessive alcohol intake, and improving insulin sensitivity have all been associated with healthier testosterone levels.
When clinically appropriate, testosterone replacement therapy may be considered after a comprehensive assessment and discussion of potential benefits, risks, fertility considerations, and ongoing monitoring.
Does Testosterone Therapy Affect Fertility?
Yes.
Although testosterone replacement therapy may improve symptoms in appropriately selected men, it can suppress sperm production and reduce fertility.
Men wishing to preserve fertility should discuss alternative treatment options with their healthcare provider before starting testosterone therapy.
Is Testosterone Therapy Safe?
Testosterone therapy is not appropriate for everyone.
Patients receiving testosterone therapy require regular follow-up to assess symptom improvement and monitor testosterone levels, blood counts, and other health markers. For some individuals, additional monitoring, such as prostate health assessment when clinically indicated, is also recommended.
The decision to begin treatment should always be individualized after discussing potential benefits, risks, and long-term goals.
The Bottom Line
Low testosterone is common, but it should never be diagnosed based on symptoms alone.
A proper evaluation combines a detailed medical history, physical examination, appropriate blood tests, and an assessment of other hormones, metabolism, nutrition, body composition, and overall health.
At ConductMD, we use the CONDUCT™ Method to understand how testosterone interacts with cortisol, thyroid function, nutrition, insulin resistance, muscle health, body composition, and overall well-being to create an individualized treatment plan.
Rather than treating a laboratory value in isolation, our goal is to identify the underlying contributors and optimize the systems that influence long-term health.
Frequently Asked Questions
Can women have low testosterone?
Yes. Testosterone plays an important role in women’s energy, muscle health, mood, bone health, cognitive function, and sexual well-being.
Is one low testosterone test enough?
No. Most clinical guidelines recommend confirming low levels with repeat morning testing together with compatible symptoms before making a diagnosis.
What is the best time to test testosterone?
Morning, typically between 7:00 AM and 10:00 AM, when testosterone levels are highest.
Can lifestyle improve testosterone?
Yes. Maintaining a healthy weight, participating in regular resistance training, getting adequate sleep, eating a balanced diet, managing chronic stress, and treating conditions such as sleep apnea may help support healthy testosterone levels in some individuals.
References
American Urological Association (AUA). Testosterone Deficiency Guideline.
https://www.auanet.org/guidelines-and-quality/guidelines/testosterone-deficiency-guideline
Endocrine Society. Testosterone Therapy for Hypogonadism Guideline.
https://www.endocrine.org/clinical-practice-guidelines/testosterone-therapy
The Menopause Society (formerly NAMS). Clinical guidance on hormone therapy and menopause.
Cleveland Clinic. Low Testosterone (Male Hypogonadism).
https://my.clevelandclinic.org/health/diseases/15294-low-testosterone-male-hypogonadism
Mayo Clinic. Male Hypogonadism.
https://www.mayoclinic.org/diseases-conditions/male-hypogonadism
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