Why dose my chest hurt when stretching and coughing plus sneezing?

Here are some possib: Some possible reasons can be, over exertion(lifting heavy articles weights etc),, myalgias(from a virus infection like Flu or another viral infection). If it does not settle down in the next 4-5 days, seek medical attention as it could be something brewing inside your chest for which may require an X-ray to check your lungs.