Washington Nationals starting pitcher Stephen Strasburg is reportedly having a recurrence of thoracic outlet syndrome symptoms, per Jon Heyman of the New York Post.
"The Nats only announced he felt discomfort after a bullpen session, and while there is no official diagnosis, the fear is it’s the very same issue," Heyman wrote.
The Mayo Clinic defines thoracic outlet syndrome as follows: "Thoracic outlet syndrome (TOS) is a group of disorders that occur when blood vessels or nerves in the space between your collarbone and your first rib (thoracic outlet) are compressed.