Brown dirt in the sputum in the morning can be caused by physiological reasons, but also by tuberculosis, bronchiectasis and other pathological reasons. 1. Physiological reasons: long-term inhalation of dust, foreign bodies, etc., may lead to its precipitation into the respiratory tract, coughing out brown sputum. 2. Pathologic causes: (1) Tuberculosis: there are hemoptysis, coughing up sputum, night sweats, low-grade fever and other symptoms appear, in which the blood clots stay in the respiratory tract for a long time may turn brown, coughing out brown secretion. (2) bronchial dilatation: it can be manifested as persistent cough, coughing up pus sputum, which can be accompanied by hemoptysis, if the blood clots remain in the respiratory tract for a long time, it will turn brown, and discharged with the sputum, which is manifested as brown sputum. Morning sputum with brown dirt may also have other reasons, such as lung cancer, lung ferritin deposits, etc. If long-term coughing up brown secretions, especially with other respiratory symptoms such as coughing, hemoptysis, etc., it is recommended to go to the hospital in time to avoid delays in the condition of the diagnosis and treatment.