The child’s eye boogers are many and yellow may be caused by diseases such as dacryocystitis, keratitis, conjunctivitis and so on. 1. Dacryocystitis: Dacryocystitis is mostly caused by the obstruction of the tear duct, the tear fluid accumulates in the lacrimal sac for a long time, which will lead to inflammation, thus the phenomenon of yellow eye boogers, and the patient may also have the symptom of localized redness, swelling and heat pain. 2. Keratitis: Keratitis refers to the inflammatory reaction of the cornea, which may be caused by bacterial, viral and other microbial infections, and may also be related to autoimmune diseases and the spread of inflammation in neighboring tissues, etc. The patient will have an increase in secretion, which will be manifested as abundant and yellowish boogers. 3. Conjunctivitis: Conjunctivitis is an inflammatory reaction that occurs in the conjunctival tissues, and pathogenic infections, contact with allergens, eye tumors and other factors, which will lead to an increase in local secretions, making the eye boogers and yellow, and there will also be a local sense of foreign body, photophobia and other symptoms. There are many reasons why children’s eye boogers are yellow, and they need to be examined and treated in a timely manner. Usually should pay attention to eye hygiene, avoid rubbing the eyes with unclean hands.