Low Testosterone: Symptoms, Causes, and Treatment for Men

Overview

Testosterone is the primary male sex hormone, produced mainly in the testicles, that regulates sex drive, sperm production, muscle mass, bone density, red blood cell production, and mood. Low testosterone, also called hypogonadism, occurs when your body produces less testosterone than normal for your age. For adult men, normal testosterone levels typically range from 300 to 1,000 nanograms per deciliter (ng/dL), and low testosterone is diagnosed when levels fall below 300 ng/dL alongside persistent symptoms. It is a common condition, affecting roughly 1 in 4 men over age 30, though many cases go undiagnosed because symptoms develop slowly and are often mistaken for normal aging or stress.

Signs & Symptoms

• Reduced sex drive and erectile dysfunction
• Persistent fatigue and low energy, even after adequate rest
• Loss of muscle mass and increased body fat, especially around the abdomen
• Mood changes including irritability, anxiety, or depression
• Decreased bone density, increasing osteoporosis risk
• Sleep disturbances, including insomnia or excessive sleepiness
• Difficulty concentrating and memory issues
• Reduced facial and body hair growth
• Hot flashes and unexplained sweating

Causes & Risk Factors

Low testosterone is classified as either primary or secondary hypogonadism. Primary hypogonadism occurs when the testicles themselves cannot produce enough testosterone, often due to testicular injury, mumps infection, chemotherapy, radiation therapy, or genetic conditions like Klinefelter syndrome. Secondary hypogonadism happens when the pituitary gland or hypothalamus in the brain does not send proper signals to the testicles to produce testosterone, which can be caused by pituitary tumors, inflammatory diseases, obesity, type 2 diabetes, certain medications (including opioids, steroids, and some psychiatric drugs), or natural aging. Key risk factors for low testosterone include being over age 30, having a body mass index (BMI) over 30, having type 2 diabetes or HIV/AIDS, having kidney or liver disease, having previous testicular or pituitary surgery, and using anabolic steroids.

Diagnosis

Diagnosing low testosterone starts with a conversation with your healthcare provider about your symptoms, medical history, and any medications you take. Your provider will order a blood test to measure your total testosterone levels, which is most accurate when drawn between 7 a.m. and 10 a.m., when testosterone levels are highest in the day. Because testosterone levels fluctuate daily, you will likely need a second test 1 to 2 weeks later to confirm low levels. If low testosterone is confirmed, your provider may order additional tests to identify the underlying cause, including blood tests for pituitary hormones, or imaging scans of the pituitary gland if a brain-related cause is suspected.

Treatment & Management

Treatment for low testosterone is tailored to the underlying cause of your condition, the severity of your symptoms, and your overall health. The first step is often addressing any underlying conditions that may be contributing to low testosterone, such as obesity, type 2 diabetes, or a pituitary disorder, which may help raise levels naturally without additional therapy. If symptoms are severe or underlying treatment is not enough, your provider may recommend testosterone replacement therapy (TRT). TRT is available in several forms, including topical gels or creams, transdermal patches, intramuscular injections, subcutaneous pellets implanted under the skin, and oral medications. Your provider will work with you to choose the best option based on your lifestyle, preferences, and health status.

Living With It

Low testosterone is a chronic condition, but most men can manage their symptoms effectively and improve their quality of life with consistent treatment and healthy lifestyle habits. You will need regular follow-up appointments with your provider every 3 to 6 months to monitor your testosterone levels, check for side effects of treatment, and adjust your care plan as needed. Most men start to notice improvements in energy, mood, and sex drive within 3 to 6 weeks of starting treatment, though full benefits like increased muscle mass and improved bone density may take 6 months to a year.

• Maintain a healthy weight through regular exercise and a balanced diet, as obesity is one of the most common reversible causes of low testosterone
• Prioritize 7 to 9 hours of uninterrupted sleep each night, as poor sleep quality can significantly lower testosterone levels
• Limit alcohol consumption and avoid anabolic steroids, both of which can disrupt normal hormone production
• Manage chronic stress through practices like meditation, deep breathing, or therapy, as high cortisol levels from stress can suppress testosterone production