Coughing up blood clots consider the following diseases: a. nasopharyngeal tumor, nasopharyngeal cancer when the nasal secretions back up into the trachea, appearing hemoptysis, need to do CT or laryngoscopy of the nasopharynx. Second, bronchiectasis, the patient mostly coughs yellow sputum and hemoptysis, and may also appear hemoptysis clots. In the case of lung tumor, lung cancer or bronchopulmonary cancer, coughing and hemoptysis, sometimes accompanied by chest tightness and wheezing can occur, and a chest CT is needed to exclude bronchiectasis and lung cancer. Third, pulmonary embolism, if combined with varicose veins of the lower extremities, lower extremity thrombosis, thrombus dislodged to will lead to pulmonary embolism, can cause chest pain, hemoptysis and coughing blood clots, need to do CTA of pulmonary artery for clear diagnosis.