Severe ptosis should be treated according to the cause, and the common causes as well as treatment measures are as follows: 1. Muscle disease: polymyositis and dermatomyositis involve the upper eyelid muscles, and ptosis occurs, which requires hormone therapy to improve symptoms. Patients with ocular myasthenia gravis also develop ptosis, which requires treatment with bromelain, hormones, and immunosuppressants; 2. Neuropathy: If an aneurysm compresses the motoneurysm, the levator muscle becomes dysfunctional, which requires nerve-nourishing drugs and also surgical treatment to remove the aneurysm; 3. Trauma and congenital dysplasia, which relies primarily on eye surgery; 4. Cerebral infarction: cerebral infarction involving the motoneurone nerve can lead to ptosis on one side of the eyelid, which requires treatment of the primary disease depending on the extent of the condition.