9 Signs Of Low Testosterone Levels & Best Ways To Test It 

James Cunningham, BSc, CPT
Published by James Cunningham, BSc, CPT | Staff Writer & Senior Coach
Last updated: January 25, 2024
FACT CHECKED by Dr. Kristy Dayanan, BS, MD
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That’s a question that I’ve been asked every time I talk to clients about low T-levels and the impacts on their health.

The thing is that most people have a completely wrong idea about the male sex hormone.

It’s not just about maintaining an erection and bodybuilder-style muscle growth.

Low testosterone levels can impact many other parts of your mind and body, and understanding what to look out for is a key part of overcoming and avoiding many health problems.

So, to help you better understand the symptoms, we’ve listed the following advice.

Quick Summary

  • To identify low testosterone levels, watch for symptoms like reduced sex drive, hair loss, fatigue, muscle and bone mass loss, weight changes, mood swings, lack of focus, memory difficulties, and erectile dysfunction.
  • Low testosterone not only affects sexual health but also has a profound impact on physical strength, mental focus, and overall well-being.
  • About 30% of overweight men and 25% of men with Type 2 diabetes are found to have low testosterone levels.
  • In my professional experience, addressing low testosterone through lifestyle changes and medical consultation can significantly improve both physical and mental health.

9 Symptoms Of Low Testosterone Levels

1. Low Sex Drive

Men often shy away from discussing it, but low testosterone significantly impacts sex drive and fertility, which is crucial for couples trying to conceive.

2. Hair Loss

man with a patch on his head over losing hair

Testosterone affects hair growth. Balding, particularly in men in their 30s, may be linked to low testosterone, not just aging, as Harvard Medical School suggests [1].

Related: Do Bald Men Have More Testosterone?

3. Fatigue

More than just feeling tired at the gym, low testosterone can cause constant, severe fatigue and a noticeable drop in motivation and concentration.

4. Loss Of Muscle And Bone Mass

fat man using a tape measure on his body

Low testosterone increases the risk of bone loss and affects muscle strength, as noted in the Clinical Interventions in Aging journal [2].

It's essential for bone and muscle health, beyond just minerals and vitamins.

5. Sudden Weight Fluctuations

In severe cases, testosterone deficiency syndrome can be a major contributor to obesity.

According to the Urology Care Foundation, about 30% of overweight men and 25% of men with Type 2 diabetes have low testosterone​ [3].

Related Articles:

6. Mood Swings

man covering his face out of frustration

Low or fluctuating testosterone levels can cause irritability, depression, and anxiety. Early recognition of these changes is crucial for mental health.

7. Lack Of Focus

Testosterone is linked to brain function and mental focus. Treating low testosterone often leads to improved focus and energy levels, enhancing cognitive performance and vitality, as stated in the Journal of the American Medical Association [4].

8. Difficulty With Memory

man with his hands on his face upset while working

Memory issues are often mistakenly attributed to aging. However, addressing low testosterone can maintain and enhance brain function.

9. Erectile Dysfunction

Low testosterone affects sperm production and sexual function, reducing nitric oxide production and thereby impacting blood flow to the penis.

“The typical signs that your testosterone may be low are commonly overlooked or mistaken for other issues which are then dealt with individually rather than as a whole. For instance, hair loss, weight gain, and fatigue are all signs of low testosterone but are often treated as individual problems."

- Lisa Richards, CNC at TheCandidaDiet.com

How To Know if You Need a Testosterone Booster?

In order to know if you need a testosterone booster, you should consider consulting a healthcare professional, especially if you're experiencing symptoms such as decreased libido, fatigue, muscle weakness, depression, or other hormonal imbalance indicators.

A medical evaluation, including blood tests, is necessary to determine if you have low testosterone levels and whether a testosterone booster is appropriate for you.

Medical Tests To Determine Low Testosterone

hand view of a person showing a blood sample

From my coaching experience, I've seen that if these symptoms worsen with age, simple blood tests are crucial to confirm low testosterone.

According to the Cleveland Clinic, testosterone levels peak in the morning and decline throughout the day, which is a crucial factor when testing [5].

If the blood test shows extremely low testosterone levels, doctors may suggest testosterone replacement therapy (TRT).

Total Blood Testosterone Level

This measures both free and bound testosterone, indicating your body's overall testosterone production.

It's crucial to assess free testosterone to determine if your body isn't effectively utilizing the hormone.

Free Testosterone Level

Also known as serum testosterone, this is the hormone freely available for bodily functions. It's critical for muscle building and strength development.

A low free testosterone level could explain symptoms like low libido and mood swings

TRT boosts testosterone to a normal range, easing low testosterone symptoms. It comes in various forms, like transdermal gels, injections, and pellets, each with specific application methods.

However, as a health coach, I stress that TRT needs careful monitoring by a healthcare professional.


Does Fasting Affect Testosterone Levels?

Yes, fasting may affect testosterone levels. Longer fasting times that last several days could lead to low testosterone. At the same time, short intermittent fasting may actually improve your low T-count.

Can Low Testosterone Cause Dizziness?

Low testosterone can cause dizziness and feeling lightheaded, and it is one of the symptoms people look out for. One of the reasons that testosterone deficiency can lead to dizziness is due to a link with anemia. The other contributing factors can be sleep apnea and disturbed sleep patterns.

Can Low Testosterone Make You Feel Cold?

Yes, low testosterone can make you feel cold. Low testosterone leads to high estrogen hormone levels that reduce body temperature by sending signals to the hypothalamus, making you cold.

Does Low Testosterone Make You Angry?

Yes, low testosterone levels can sometimes make you angry. This is because testosterone influences many physical and psychological aspects of health, and fluctuations in hormone levels can impact mood and emotional state.

Can Low Testosterone Cause Migraines?

Yes, low testosterone can cause migraines. Low testosterone is linked to migraines as hormonal imbalance causes estrogen levels to rise, resulting in common episodic cluster headache disorders.

Can Low Testosterone Make You Emotional?

Yes, low testosterone can make you emotional, as testosterone is a neuroactive steroid that impacts the central nervous system. Thus, a drop in this hormone can cause physical and emotional symptoms like anxiety and depression.

How to Test Testosterone at Home?

To test testosterone at home, order a test kit, take a sample, activate the test process, send the sample to the lab, and finally wait for the results.

Can Low Testosterone Cause Night Sweats?

Yes, low testosterone can cause night sweats. Similar to how hormonal imbalances during menopause can lead to hot flashes in women, low testosterone in men can result in night sweats.

Can Low Testosterone Cause Brain Fog?

Yes, low testosterone can cause brain fog because this hormone can stimulate electrical activity in the brain by activating certain cortical networks. Balancing T levels can alleviate difficulties with concentration and mental clarity.

Is There a Connection Between Low Testosterone and Immune System?

Yes, there is a connection between low testosterone and the immune system. When levels are either too low or too high, it seems to weaken the intensity of the immune response.

Can Low Testosterone Cause Diabetes?

Low testosterone might cause type 2 diabetes in men. This is because testosterone plays a role in how the body manages insulin and glucose. However, it's important to note that this relationship is complex, and other factors like obesity, lifestyle, and overall health also significantly contribute to the risk of diabetes.

Can Low Testosterone Cause Anxiety?

Yes, low testosterone can cause anxiety. Testosterone plays a role in regulating mood and mental health, and a deficiency can impact emotional state and psychological well-being.


  1. https://www.health.harvard.edu/mens-health/testosterone-prostate-cancer-and-balding-is-there-a-link-thefamilyhealth-guide
  2. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5036835/
  3. https://www.urologyhealth.org/urology-a-z/l/low-testosterone
  4. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5433758/
  5. https://my.clevelandclinic.org/health/diseases/15603-low-testosterone-male-hypogonadism
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About The Author

James Cunningham, BSc, CPT
Staff Writer & Senior Coach
James Cunningham, BSc, CPT holds a BSc degree in Sport & Exercise Science from University of Hertfordshire. He's a Health & Performance Coach from London that brings a unique blend of academic knowledge of health supplements and practical exercise experience to the table for his readers.
Learn more about our editorial policy
Dr. Kristy June Dayanan, BS, MD is an author with a BS degree from University of the Philippines and an MD from University of Perpetual Help System. Her ability to simplify medical science complexities and dietary supplement jargon for the average reader makes her a valued medical fact checker and reviewer.
Learn more about our editorial policy
Dr. Harshi Dhingra, MBBS, MD is a published peer-reviewed author and renowned physician from India with over a decade of experience. With her MBBS from Bharati Vidyapeeth and an MD from Rajiv Gandhi University, she actively ensures the accuracy of online dietary supplement and medical information by reviewing and fact-checking health publications.
Learn more about our editorial policy

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