Cough and sputum symptoms may be caused by colds, chronic pharyngitis, bronchitis and other diseases. 1. Colds: Colds are caused by viral infections. When viruses infect the mucous membranes of the throat, they can cause swelling and increased exudate in the throat, resulting in cough and sputum. 2. Chronic pharyngitis: patients with chronic pharyngitis will also be stimulated by local inflammation, resulting in an increase in secretions, causing patients to cough, sputum and other symptoms. 3. Bronchitis: If acute inflammation of the bronchial mucosa occurs due to allergic factors, physical or chemical stimuli or pathogenic microbial infections, it may cause symptoms such as cough and sputum. Cough, sputum symptoms can also be seen in other diseases, such as symptoms do not improve or aggravate, it is recommended that patients go to the regular hospital in a timely manner, to identify the cause of the disease, under the guidance of a professional doctor to take targeted treatment.