There are many reasons for frequent blinking. Common causes include refractive error, eyelid impingement or entropion, allergy, eye inflammation, dry eye, and also mental factors. 1. Refractive error: usually seen in children, due to refractive error caused by blurred vision, reduced visual quality, will stimulate children through frequent blinking to regulate in order to ease the discomfort. 2. Eyelid impingement or entropion: Generally seen in children, impingement and entropion can irritate the surface of the eye, thus causing the patient to blink frequently. 3. Allergy: patients with allergies are exposed to external allergens, such as willow, pollen, dust, animal fur, etc. After the stimulation of these triggering factors, patients show symptoms such as itching, conjunctival congestion, conjunctival edema, etc., and they sometimes blink frequently in order to alleviate the discomfort. 4. Ocular inflammation: Often, inflammation in the eye may lead to discomfort, resulting in reflexive blinking. Common diseases include: blepharitis, blepharitis, keratitis, conjunctivitis and so on. 5. Dry eye: These patients will have fewer tears, foreign body sensation, burning sensation and other discomforts in the eyes, which will be relieved by frequent blinking. 6. Mental factors: for example, children with ADHD will also show symptoms of frequent blinking, due to the patient’s abnormal brain activity, resulting in eye muscle tremors, frequent blinking. The causes of frequent blinking are complex, and you should seek medical attention in a timely manner for examination and treatment under the guidance of a doctor.