High density foci in the tracheal lumen suggests that there is a foreign body in the trachea, such as sputum embolus, tuberculosis or tumor, and may also be caused by tracheal inflammation. It is recommended to further clarify the cause of tracheal hyperintensity foci by CT and fiberoptic bronchoscopy before appropriate treatment. If the high density foci are caused by sputum embolism, nebulization or oral sputum chemotherapy (e.g., ambroxol, acetylcysteine, etc.) can be used to promote the expulsion of sputum embolism. If it is caused by tuberculosis, anti-tuberculosis drugs (e.g. rifampicin, isoniazid, etc.) need to be taken for standardized anti-tuberculosis treatment. If it is caused by bronchial tumor, anti-tumor treatment can be carried out by surgical resection or chemotherapy. If it is caused by tracheal inflammation, appropriate anti-infective treatment (e.g. cephalosporin, macrolide antibiotics, etc.) can be administered. There are many causes of high density foci in the lumen of the trachea, and the treatments vary. If this phenomenon appears during the examination, it is recommended to do further examination to clarify the cause of the disease before the corresponding treatment.