Many things: Most common cause would be a "pulled muscle", but this may be a sign of something more serious such as a pneumothorax, pleural effusion or another pleural problem. If it gets worse or does not go away in a few days by itself or with over-the-counter medicines, consult a doctor.
Answered 3/19/2013
5.7k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question