What are the symptoms of low testosterone — the complete list?

The validated symptom constellation of hypogonadism in men includes: (1) sexual symptoms, reduced libido, erectile dysfunction, reduced spontaneous erections; (2) physical symptoms, loss of muscle mass and strength, increased body fat (particularly visceral), decreased bone density, fatigue, loss of body hair, reduced shaving frequency, gynecomastia; (3) psychological symptoms, depressed mood, reduced energy, poor concentration, irritability, sleep disturbance (Bhasin et al., J Clin Endocrinol Metab, 2010).

The diagnostic standard requires: specific hypogonadal symptoms present, AND two morning total testosterone measurements below the threshold (300 ng/dL by most guidelines), AND exclusion of secondary causes (illness, obesity, medications, sleep apnea, hypothyroidism). Men presenting with all the symptoms but testosterone of 420 ng/dL are not hypogonadal by current diagnostic criteria, though their quality of life may be genuinely diminished. The symptom burden matters, but the diagnosis requires the biochemical confirmation.

Honesty Scale: Solid (1) for the symptom-plus-biochemical diagnostic standard.

What to do: Use the validated Aging Males' Symptoms (AMS) scale or ADAM (Androgen Deficiency in Aging Males) questionnaire to quantify your symptom burden before your physician appointment. This helps make the clinical conversation more precise and gives the physician a baseline against which to measure treatment response.

For the full picture, read The Testosterone/TRT Deep Dive