Coughing with blood in sputum after a cold is mainly considered as dryness of the respiratory mucosa or inflammation that damages the capillaries of the mucosa and causes bleeding. Patients need to pay attention to moisturizing the respiratory tract and avoid spicy and fried foods on a daily basis. If coughing with sputum and blood in sputum is persistent, you need to seek medical attention promptly to exclude pneumonia, bronchitis, tuberculosis, nasopharyngeal carcinoma, lung cancer and other diseases. If the blood comes from the nose, you can visit the ENT department; if the blood comes from the airway, you should visit the respiratory department.