Sputum is brown in the morning. Generally speaking, the airways secrete a lot of secretions during the night while sleeping, and sputum appears. In the case of patients who smoke or who usually like to eat chili peppers, at this time there will be some trace blood leaking out of the trachea, and in the morning when you wake up, it will be coughed out of the body with the sputum in one piece, and brown sputum will be formed. This is not a serious disease in itself, and often suggests a relationship with smoking or eating chili peppers on fire. If this signal appears, it is advisable for the patient to quit smoking as soon as possible; in addition, try to keep the diet as light as possible and not to be exposed to too much chili or smoke to prevent further aggravation of the disease.