U.S. doctors online nowAsk doctors free
A 36-year-old member asked:

What is the cause of tiredness from running?

1 doctor answer1 doctor weighed in
Dr. Ronald Oberman
Podiatry 33 years experience
Several things: Muscle fatigue, shortness of breath, decreased oxygen supply are most common assuming your otherwise healthy.
Created for people with ongoing healthcare needs but benefits everyone.
Last updated Feb 18, 2013

Disclaimer:

Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.