It’s a question many runners grapple with when training: Should you rest or run when you’re coming down with a cold?

Cordelia W. Carter, MD, director of the Women’s Sports Medicine Center and orthopedic surgeon at the Sports Medicine Center at NYU Langone, tells Runner’s World that running may actually alleviate some cold symptoms.

“Running may decrease some of the congestion in the nose and sinuses, and you will still feel that natural endorphin high when you’re finished,” says Dr. Carter.

But, Dr. Carter, who is also a clinical associate professor in the Department of Orthopedic Surgery, warns there are several signs people should look out for that are clues that it’s time to skip the run or exercise session.

Read more from Runner’s World.