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Adult Male Hypogonadism: A Review
Bradley D Anawalt1, Kim M O'Connor1, Mathis Grossmann2,3
1Department of Medicine, School of Medicine, University of Washington, Seattle.
JAMA
|May 28, 2026
Summary
Male hypogonadism, characterized by low testosterone, affects 2-8% of men, especially with obesity. Weight loss is the primary treatment for obesity-induced cases, while testosterone therapy is for permanent or medication-induced hypogonadism.
Area of Science:
- Endocrinology
- Men's Health
- Reproductive Medicine
Background:
- Male hypogonadism is a syndrome of testosterone deficiency with symptoms like decreased libido and spontaneous erections.
- Prevalence varies: <1% for primary hypogonadism (testicular pathology) and 2-8% for secondary hypogonadism, often linked to obesity (BMI ≥30).
Purpose of the Study:
- To outline the diagnosis and management of male hypogonadism.
- To differentiate between primary and secondary hypogonadism.
- To highlight treatment strategies based on the cause and severity.
Main Methods:
- Diagnosis involves assessing signs/symptoms of androgen deficiency.
- Confirmation requires at least two fasting morning serum testosterone measurements below 264-300 ng/dL.
- Distinguishing primary from secondary hypogonadism involves measuring luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels.
Main Results:
- Obesity-induced hypogonadism is common, with weight loss (≥5%) significantly improving testosterone levels and sexual function.
- Primary hypogonadism, often due to Klinefelter syndrome, affects 2 in 1000 men.
- Secondary hypogonadism causes include head trauma, radiation, and medications (opioids, corticosteroids).
Conclusions:
- Weight loss is the recommended first-line treatment for obesity-related hypogonadism.
- Testosterone therapy is indicated for permanent hypogonadism or when causative medications cannot be stopped.
- Individualized testosterone formulations and dosages are crucial, with regular monitoring.
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