Discomfort in mid back, just below shoulder blades. find it harder to take deep breaths & deep breaths cause discomfort in mid to left side of chest?

Neuralgia: Pain radiating from under the shoulder blade around to under the breast may be due to compression(pinch) of a thoracic nerve as it travels along the under side of the rib. Sleeping in an awkward position is one cause. The pain can be severe. It is usually a temporary problem but can last for several weeks. If OTC NSAIDS don't help gabapentin can be very effective.