What Are the Signs of Low Testosterone in Men?
Dr. James D. Fontaine
4/15/2026
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Low testosterone is more common than you might think, but the signs are often mistaken for stress or normal signs of aging. Low T symptoms may include low energy, reduced muscle mass, increased body fat, mood changes, brain fog, low libido, erectile dysfunction (ED), or poor sleep.
The good news? Treatments like hormone optimization can make a big difference and improve your quality of life.
At Fontaine MD Aesthetics and Anti-Aging Medicine in San Diego, CA, Dr. James D. Fontaine specializes in helping men identify the root cause of their issues and create a treatment plan that delivers results. Call today to schedule testosterone therapy and start feeling like yourself again.
What causes low testosterone?
So, what causes low testosterone? For many men, the primary cause is simply age. Testosterone levels are highest in early adulthood and then gradually decrease over time.
However, age isn't the only factor. Testosterone levels can also drop more significantly due to chronic stress, certain medications, and underlying health conditions like thyroid disorders. Pinpointing what causes low testosterone in your specific situation is the first step toward effective treatment. For many, solutions like testosterone therapy can help restore balance and improve overall well-being.
Low T symptoms to watch for
Low T can show up in a variety of ways. Here are some common signs that your testosterone levels might be out of balance:
- Fatigue and low energy: Feeling consistently drained regardless of how much you sleep
- Reduced muscle mass: Difficulty building or maintaining muscle, even with regular exercise
- Increased body fat: Usually around the abdomen, without any major changes in diet
- Mood changes: Irritability, depression, or a general feeling of anxiety
- Brain fog: Trouble concentrating or feeling mentally sharp
- Low libido: A noticeable and persistent drop in sex drive
- Symptoms of erectile dysfunction: Difficulty achieving or maintaining an erection
- Poor sleep: Insomnia or disrupted sleep patterns that leave you feeling unrested
If one or more of these issues sound familiar, including mood changes or symptoms of erectile dysfunction, getting your levels tested in San Diego, CA is a straightforward way to find out whether low testosterone is the cause.
How we treat low testosterone
Hormone optimization at Fontaine MD Aesthetics and Anti-Aging Medicine starts with a thorough evaluation of your blood work and health history. From there, we can recommend a hormone delivery method that fits your lifestyle and goals. Options include:
- Hormone pellets: These are tiny implants placed just under the skin. Hormone pellets release a steady, gradual dose of testosterone over several months.
- Injections: This involves injecting testosterone directly into a muscle. Injections are typically scheduled on a regular basis.
- Topical gels and creams: If you prefer a noninvasive option, you can apply a gel or cream to your skin daily. It’s a convenient way to get a consistent dose of hormones.
- Patches: Another easy-to-use option. You simply wear a patch on your skin and change it regularly to achieve a steady release of testosterone throughout the day.
Most men begin noticing improvements within the first few weeks of starting testosterone therapy, with more meaningful changes developing over the following months.
Start feeling like yourself again
Low T symptoms are not something you have to live with when effective treatment exists. At Fontaine MD Aesthetics and Anti-Aging Medicine in San Diego, CA, Dr. James D. Fontaine brings a personalized, evidence-based approach to hormone optimization for each patient.
Whether you have questions about hormone pellets or want to understand more about the symptoms of erectile dysfunction, we can help. Call today to schedule your consultation.
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