Blood in sputum after 2 months after lung cancer surgery is usually normal, depending on the blood condition, there are two kinds of blood: black blood and fresh blood. If it is black blood, consider the blood left in the trachea lumen during surgery. Because lung cancer surgery is traumatic to lung tissues, there will be small blood seepage during surgery, which accumulates in the lumen or distal end of the bronchial tubes, and after a period of time, it will turn into black stale blood accumulation or blood clots. It is normal for patients to cough up these clots by coughing after surgery. If the blood is fresh, consider pulmonary endotracheal hemorrhage or bleeding from the tracheal stump. Because of the surgical stimulation of the bronchial mucosa congestion, edema, patients coughing after surgery will lead to congested capillaries rupture, then there will be blood in the sputum or hemoptysis phenomenon. Generally, there is no need for special treatment, and patients can eat more high-protein, high-energy and easy-to-digest foods to replenish blood, such as lotus seed, turtle, milk, soybean products and so on, to improve the situation. Blood in sputum after 2 months after lung cancer surgery can consult doctor in time for clear diagnosis and treatment to prevent recurrence without unauthorized medication.