I've been coughing a lot and now my middle back hurts when I breathe. What could this be?
Coughing regularly can itself cause back pain. "Smoker's cough" for instance is often associated with back pain caused by muscle strain. If you're not a smoker and you're still coughing alot then you could have some lung issues and you should see a doctor for that. Pain when you breathe in can also be associated with some heart issues. All in all you should get this checked by a doctor.
Coughing, laughing and sneezing also cause an increased amount of pressure in the spinal discs. If a disc is herniated or torn, then the increased, sudden pressure will cause severe back pain. One strategy is to lean up against the wall or squeeze against a pillow to add increased support while coughing, laughing and sneezing.
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Do you have a cold or respiratory infections? Coughing can jar your body and make you hurt all over. It is similar to being slammed against a wall.
Are you taking any medication? I would check to see if a cough is a side effect. I know Lisinopril (blood pressure medication) can cause a dry cough. I like to use Drug.com to check for side effects. They have a professional handout that list all the side effects, even it is rare.
See your doctor; this could be a serious matter or something as simple as changing a medication, but you have to see the doctor to find out.