Low testosterone—also called testosterone deficiency syndrome (TDS) or hypogonadism—occurs when the body produces insufficient levels of the male sex hormone, testosterone. This hormone plays a vital role in male physical and emotional health. While testosterone levels naturally decline with age (usually after age 30), a significant drop may lead to noticeable symptoms.
Common Symptoms of Low Testosterone
Physical Symptoms
- Persistent fatigue or low energy levels
- Loss of muscle mass and strength
- Increased body fat, particularly in the abdomen and chest (sometimes causing gynecomastia, or enlarged breasts)
- Decreased bone density, which increases the risk of fractures
- Hair thinning or loss, especially facial and body hair
- Hot flashes or night sweats
- Anemia (low red blood cell count) in some cases
Sexual and Reproductive Symptoms
- Low sex drive (reduced libido)
- Erectile dysfunction or weaker erections
- Fewer spontaneous erections, especially during sleep
- Reduced semen volume
- Infertility due to poor sperm production
- Testicular shrinkage in some cases
Emotional and Mental Symptoms
- Mood changes, including depression, sadness, or irritability
- Decreased motivation or confidence
- Difficulty concentrating, poor memory, or “brain fog”
- Sleep disturbances, including insomnia or poor sleep quality
Causes of Low Testosterone
- Aging (natural decline starts around age 30)
- Obesity or sedentary lifestyle
- Chronic illnesses such as type 2 diabetes or kidney disease
- Injury or trauma to the testicles
- Pituitary gland disorders
- Certain medications, including opioids or steroids
- Excessive alcohol use
- High stress levels
When to See a Doctor
If you experience several of these symptoms—especially persistent fatigue, low libido, or mood changes—it’s a good idea to consult a healthcare provider. A blood test can measure your total and free testosterone levels, usually in the morning when levels are highest.
Diagnosis and Treatment
- Diagnosis involves blood testing, medical history, and physical exams.
- Treatment may include testosterone replacement therapy (TRT) via injections, gels, patches, or pellets.
- Lifestyle changes, such as losing weight, exercising regularly, managing stress, and sleeping well, can also improve hormone levels naturally.