Sudden pain in back of left lower ribs. not strained or had injury hurts more when i breathe?

More information: Have you recently traveled a long distance or had surgery or an illness where you had to lie around a lot? Do you take oral contraceptives? Are you short of breath? Pain like yours can indicate a pulmonary embolus, which is a blood clot in the lung. That can be dangerous, so it's best to have it checked in person right away.