The causes of sudden stabbing pain in the eyes are considered to be related to foreign bodies in the eyes, impingement, acute conjunctivitis and other factors. 1. Foreign body in the eye: If the patient suddenly enters a foreign body in the eye, such as gravel, dust, animal hair, etc., it may cause sudden stabbing pain in the eye due to abrasion of the surface of the eyeball. 2. Inverted eyelashes: this refers to the abnormal position of the eyelash follicles, the eyelashes grow backward towards the eyeball, so it will produce stinging pain, photophobia, tearing and foreign body sensation because of rubbing the cornea. 3. Acute conjunctivitis: If the patient has acute conjunctivitis caused by microbial infection, it will also produce eye stinging, congestion, foreign body sensation, tearing and other symptoms. There may be other reasons for the sudden stinging of the eyes, so it is recommended that the patient go to the ophthalmology department of the hospital, cooperate with the doctor to complete the examination, and then give the appropriate treatment and therapy.