1 Pneumonia or blood clots in the vessels supplying the lungs tend to cause shortness of breath and sharp pains that intensify with a deep breath. 2  Pericarditis. 3  Inflammation of the tissues around the heart (pericarditis) can cause a sharp pain that often worsens when you lie down. 4  Costochondritis. Lung conditions. 2  Pneumonia or blood clots in the vessels supplying the lungs tend to cause shortness of breath and sharp pains that intensify with a deep breath. 3  Pericarditis. 4  Inflammation of the tissues around the heart (pericarditis) can cause a sharp pain that often worsens when you lie down.
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