Granular sputum is mainly considered to be caused by infectious diseases of the respiratory tract, where the inflammatory stimulus increases the secretions of the respiratory tract. If the sputum is sticky and not discharged in time, the water in the sputum will evaporate and cause granular sputum, which is easily caused by wind-heat cough and lung yin deficiency. You need to drink more water, eat a light diet, and eat more fresh vegetables and fruits. It also needs to be treated with phlegm-thinning drugs, such as aminoglutethimide granules and acetylcysteine, and can be actively treated with oral herbs that nourish yin, moisten the lungs, clear heat, remove fire, stop coughing and resolve phlegm. Elderly patients are weak and unable to expel phlegm in time also have certain effects, and need to do nebulized inhalation to help phlegm expulsion.