Pleurisy is when the double membrane (pleura) that lines the chest cavity and surrounds each of your lungs becomes inflamed. The condition, also called pleuritis generally causes sharp chest pain, almost always during the act of breathing.
The two layers of pleura are like two pieces of smooth satin rubbing against each other with almost no friction, allowing your lungs to expand and contract when you breathe.
When these become inflamed, they rub against each other, producing pain when you inhale and exhale.However... "between breaths", you feel almost no pain at all.
It occurs as a complication of a wide possible variety of underlying conditions. An attempt to relieve pleurisy, this would involve treating the underlying condition (if known) and using pain medication.
Other causes for what you have mentioned could be a respitory infection, pnuemonia, along with several other disorders. In this case, your best option is to see a pulminologist to get a correct evaluation and diagnosis for you.
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