The general causes of recurrent upper respiratory tract infections are the following: ① micronutrient deficiency; ② primary or secondary immunodeficiency; ③ congenital malformations including congenital ciliary dyskinesia, congenital eccrine dysphagia, congenital tracheal softening, etc.; ④ chronic lesions, such as chronic paranasal sinusitis, tonsillitis, branched expansion, etc.; ⑤ other, such as malnutrition such as: abnormal protein loss in nephropathy, Enteritis, etc.; ⑥ environmental factors: environmental pollution, passive smoking, excessive indoor decoration of harmful substances generated by stimulating the respiratory mucosa, and so on can lead to recurrent respiratory tract infections. It is recommended that you go to the hospital for diagnosis and treatment.