Photophobia, also known as photophobia, is usually caused by the following diseases: 1. The most common cause is systemic diseases, especially cerebrovascular diseases, which can lead to photophobia and fear of light, such as migraine, trigeminal neuralgia or facial neuritis, meningitis, epidemic encephalomyelitis, septic meningitis, etc. Clinical symptoms and manifestations of photophobia can occur. 2. Acute stroke and cerebrovascular accidents such as subarachnoid hemorrhage and extensive cerebral hemorrhage may also cause photophobia, fear of opening the eyes, rotation of vision, and vertigo. 3, hyperthyroidism and thyroid crisis may also cause photophobia or fear of opening the eyes and tears in the wind. 4, acute inflammatory eye infections such as conjunctivitis, keratitis, sclerositis, and corneal ulcer may also cause photophobia and fear of light.