The causes of otitis media in children include pathogen infection, Eustachian tube dysfunction, and metamorphosis, etc. It is recommended to consult a doctor in time. 1. Pathogen infection: including bacteria such as pneumococcus, Haemophilus influenzae, staphylococcus, and viral infection such as adenovirus, which is more likely to be infected because of the size and shape of the Eustachian tube and the immune system of the child is not fully developed. 2. Eustachian tube dysfunction: such as children’s adenoid hypertrophy, hypertrophic rhinitis, etc. can block the Eustachian tube, or poor elasticity of the cartilage of the Eustachian tube, the Eustachian tube opening and closing of the Eustachian tube muscle contraction and other dysfunctions, which can make the middle ear of the normal secretion discharge obstacles, leading to middle ear infections. 3. Metabolic reaction: chronic secretory otitis media may also belong to the pathological process mediated by anti-infection immunity. Children with otitis media should seek medical attention in a timely manner, under the guidance of a doctor to clarify the cause of the disease, and to carry out the appropriate treatment, to avoid blind judgment on their own, so as not to delay the condition.