It hurts my left side of my chest when i cough but does not hurt when i breath?

if i cough it hurts where it feels my heart is.i dont notice any blood in my spit or anything though. what could this be? been going on for about a month and got alittle worse. its only pain in my left side of my chest when i cough.im 23 and male if it matters.
Update: if it matters i also been having algergies and runny noses
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