I have chest pains when I cough, yawn or when I take a deep breath. What could be wrong?

Pleuritis. It sounds like you are experiencing pleuritic chest pain, which is pain that is made worse by expansion of the thoracic cavity, such as with a deep inhalation. I don't know how long you have had the pain, but you may have pleuritis (or inflammation of the lining of the lung), which may result from a viral infection or adverse effects of a medication you might be on. See your doc for workup.

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