Coughing
Blood-stained or bloody sputum can be produced by coughing, which indicates that blood clots are blocking the normal function pulmonary arteries. Coughing can be accompanied by sharp pain, which the patient feels when breathing deeply. Coughing can be so painful that it prevents you from taking deep breaths. Coughing can be caused by blood clots that form in the lungs when you bend or stoop, causing pain.