There's no single blood test or clear sign that doctors can use to diagnose overtraining. Instead, they rely on a mix of how you feel (like mood and fatigue) and lab tests (like hormones and inflammation), but none of these are very accurate on their own.

There's no single blood test or clear sign that can definitively tell if someone has overtraining syndrome. Doctors instead use a mix of mood surveys and lab tests like cortisol or testosterone, but none of these are very accurate on their own.

For male athletes who train hard, checking a mix of things like mood, diet, body fat, and hormone reactions might be a better way to spot overtraining than just looking at one blood test.

Nine simple check-ins about mood, eating, and how you're feeling during workouts can tell if a male athlete is overtrained — no blood tests or fancy machines needed.

There's no blood test or body signal that reliably shows when someone is overtrained — the best way to tell is by how long it takes their performance to bounce back.

Doctors can't use a single blood test or scan to diagnose overtraining — instead, they have to rule out other health problems and see if an athlete's performance keeps dropping for no clear reason.