Lung cancer does not necessarily bring blood in sputum every day. Lung cancer patients usually do not cough up sputum with blood every time in the early stage, and there are no patients with blood in sputum. If the patient is in advanced stage, it will lead to hemoptysis and there will be blood in sputum every day. Patients with lung cancer do not necessarily have the symptom of blood in sputum every day. Lung cancer patients have the symptom of blood in sputum because the lesions invade the capillaries in the lungs of the patients, which leads to the rupture of blood vessels in the lungs of the patients, resulting in the phenomenon of coughing up sputum with blood in sputum. In the early stage, patients usually do not have the phenomenon of capillary rupture every day, so they do not have the phenomenon of blood in sputum every day. If the lung cancer patient is in advanced stage, the lung cancer tissues may invade the larger blood vessels in the lungs, which may lead to hemoptysis. Therefore, patients will have the symptom of blood in sputum every day. Lung cancer patients may not have the symptom of blood in sputum every day, and patients should consult doctor in time when they have the symptom of lung cancer with blood in sputum.