What are the signs of low testosterone?
Last updated September 3, 2026.
MedlinePlus-listed signs: low sex drive, erection problems, low sperm count, insomnia, shrinking muscle and strength, and bone loss - often with low mood, fatigue, and belly fat alongside. Some men with low levels feel nothing. The caution: every sign has more common explanations (stress, poor sleep, depression, alcohol), so symptoms alone cannot diagnose low T. The only real test is a blood draw between 7 and 10 a.m., repeated on a second morning if low - one reading never confirms it. Levels drift down gradually from about 40; that is normal aging, not disease. If the signs cluster, ask your doctor for the morning blood test rather than buying unproven supplements. Pymander is a free AI doctor, 24/7 by text, and can help you sort your pattern first.
What to do
- Know the cluster: lost sex drive plus erection changes is the pattern worth testing.
- Test in the morning: 7 to 10 a.m. draw, repeated if low - one reading is not a diagnosis.
- Fix the look-alikes first: sleep, alcohol, weight, stress, mood.
- Skip the supplement aisle: unproven boosters cost money and some carry real risks.
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