Low Testosterone Symptoms: Signs You Might Have Low T

Fatigue, brain fog, low libido — these could be signs of low testosterone. Here's what to look for and when to get tested.

Updated December 20256 min read

Common Symptoms of Low T

Energy & Mood

  • • Persistent fatigue
  • • Brain fog, difficulty concentrating
  • • Irritability, mood changes
  • • Depression symptoms

Sexual Function

  • • Low libido (reduced sex drive)
  • • Erectile dysfunction
  • • Reduced morning erections
  • • Decreased satisfaction

Body Composition

  • • Muscle loss despite exercise
  • • Increased body fat (especially belly)
  • • Decreased strength
  • • Gynecomastia (breast tissue)

Other Signs

  • • Poor sleep quality
  • • Reduced bone density
  • • Decreased body hair
  • • Hot flashes (less common)

What Counts as Low T?

<300

ng/dL

Clinically low

300-450

ng/dL

Borderline

>450

ng/dL

Normal range

Symptoms matter as much as numbers. Some men feel great at 350, others feel terrible at 450. Both levels and symptoms are considered for diagnosis.

When to Get Tested

Consider testing if you have multiple symptoms, especially:

  • • Age 30+ with persistent fatigue and low libido
  • • Difficulty building muscle despite training
  • • Sexual function issues without clear cause
  • • Unexplained mood changes or depression

Testing is simple: a blood draw, ideally in the morning when testosterone peaks.

Check Your Levels

Hone Health offers at-home hormone testing. No lab visit required. Results in about a week.

Get Tested →