Could be serious: A severe drop in your ability to exercise should be evaluated by a doctor. Although it could be as minor as a cold, or just overtraining, it could be an early sign of a serious heart or lung condition.
Answered 2/13/2013
5.7k views
6 doctors weighed in across 2 answers
A doctor has provided 1 answer
7 doctors weighed in across 3 answers
2 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question