Feeling tired all the time, losing interest in sex, or noticing that workouts are not paying off the way they used to? Many men write these off as stress or getting older. Sometimes that is exactly what it is. But sometimes the cause is low testosterone, also called low T or male hypogonadism, and it is worth checking.
This guide covers the common symptoms, what can cause low testosterone, how it is diagnosed, and what to do next. It is educational only and is not medical advice.
What Is Testosterone, and What Does It Do?
Testosterone is the main male sex hormone. It is made mostly in the testes, and its production is controlled by signals from the brain (the hypothalamus and pituitary gland). In men, testosterone helps support:
- Sex drive and sexual function
- Muscle mass and strength
- Bone density
- Red blood cell production
- Fat distribution
- Energy, mood, and focus
Levels naturally peak in early adulthood and tend to decline gradually with age. A lower level is not automatically a problem. It becomes a medical concern when levels are consistently low and you have symptoms that fit.
Common Symptoms of Low Testosterone
Symptoms develop slowly and vary from person to person. Commonly reported ones include:
- Lower sex drive (reduced interest in sex)
- Erectile difficulties, such as fewer morning erections or trouble getting or keeping an erection
- Fatigue and low energy that does not improve with rest
- Reduced muscle mass or strength, even with regular exercise
- Increased body fat, especially around the midsection
- Mood changes, such as irritability, low mood, or less motivation
- Difficulty concentrating or "brain fog"
- Poor sleep
- Lower bone density over time, which is usually only found through testing
Important: none of these symptoms is specific to low testosterone. Poor sleep, depression, thyroid problems, certain medications, and many other conditions can cause the same complaints. That is why symptoms alone are never enough for a diagnosis.
What Can Cause Low Testosterone?
Low testosterone has two broad categories of causes. Primary causes involve the testes themselves. Secondary causes involve the brain signals that tell the testes to produce testosterone.
Factors that are commonly associated with low levels include:
- Aging
- Excess body weight or obesity
- Type 2 diabetes and metabolic syndrome
- Obstructive sleep apnea
- Certain medications, including long-term opioid use and corticosteroids
- Testicular injury, infection, or past treatment such as chemotherapy or radiation
- Pituitary or hypothalamic conditions
- Chronic illness, such as kidney, liver, or lung disease
- Heavy alcohol use
- Use of anabolic steroids, which can shut down the body's own production
Because some of these causes are treatable, finding the reason behind a low level matters as much as the number itself.
How Is Low Testosterone Diagnosed?
Diagnosis generally takes two things: symptoms that fit and consistently low blood levels.
- Medical history and symptom review. Your provider will ask about symptoms, health conditions, medications, sleep, and lifestyle.
- Blood tests. Testosterone is checked with a blood draw, typically in the early morning because levels are highest then. Guidelines generally call for two separate morning measurements before confirming a low level. A total testosterone level below roughly 300 ng/dL is commonly used as a reference point, though labs and providers interpret results in the context of the whole picture.
- Additional tests when needed. Your provider may check other hormones (such as LH and FSH, which help identify the cause), thyroid function, blood count, and other markers.
Testosterone levels can swing from day to day, and illness, poor sleep, and fasting status can all affect a single reading. That is why one result is rarely the whole story.
When to Get Tested
It is reasonable to talk to a provider if:
- You have several of the symptoms above for more than a few weeks
- Symptoms are affecting your work, relationships, mood, or quality of life
- You have a condition linked to low testosterone, such as type 2 diabetes, obesity, or sleep apnea
- You take medications known to lower testosterone
You do not need to wait until things feel severe. Testing is simple, and even if your levels are normal, you will have ruled something out and can look for other causes.
What Happens If Testosterone Is Low?
If low testosterone is confirmed, your provider will first look for reversible causes. Improving sleep, treating sleep apnea, losing excess weight, adjusting medications, and managing other conditions can all affect testosterone levels.
For some men, testosterone replacement therapy (TRT) may be discussed. Options include injections, creams, and other approaches, depending on the person. TRT is a long-term medical treatment, not a quick fix, and it is not right for everyone. Points to understand before starting:
- It can reduce sperm production and fertility. This is important if you want children in the future, and other approaches may be discussed instead.
- It requires ongoing monitoring, including follow-up labs for things like testosterone levels, blood count, and prostate health markers.
- It is not recommended for men with certain conditions, such as some prostate or breast cancers, and it needs extra caution with others.
- Results vary, and there are no guarantees.
A good provider will walk through the benefits, risks, and alternatives with you and will not rush you into treatment.
Getting Tested in Utah
RenewRx offers evaluations in person at our Holladay, Utah location and online for Utah patients. If you want to find out whether low testosterone could be behind how you have been feeling, start here:
Frequently Asked Questions
What is a normal testosterone level?
Reference ranges differ between labs, but a total testosterone level below about 300 ng/dL is commonly used as a threshold for low testosterone. Your provider will interpret your results alongside your symptoms and other tests.
Can young men have low testosterone?
Yes. While levels decline with age, low testosterone can occur at any adult age because of medical conditions, medications, injuries, or other causes.
Can lifestyle changes raise testosterone?
For some men, improving sleep, losing excess weight, exercising (especially strength training), and limiting alcohol can help. How much they help depends on the cause and the person.
Does low testosterone cause erectile dysfunction?
It can contribute, but erectile dysfunction has many causes, including blood flow, nerve function, diabetes, medications, and stress. Treating low testosterone does not always resolve ED, so a full evaluation is useful.
Do I need a prescription for testosterone therapy?
Yes. Testosterone is a controlled substance in the United States and is only prescribed after an evaluation by a licensed provider.
How long does it take to feel a difference on treatment?
It varies. Some people notice changes within weeks, while others take months, and some do not notice much. Your provider will set expectations based on your situation and monitor your progress.
This article is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Individual results vary, and treatment is only provided after an evaluation by a licensed provider. Talk with a qualified healthcare professional about your own situation.
