The causes of right eyelid ptosis include myasthenia gravis, actinic nerve palsy, and muscular diseases, as follows: 1, myasthenia gravis: this is a neuromuscular junction disease, eyelid ptosis is fluctuating, lighter in the morning and heavier in the afternoon, and it has obvious pathologic fatigue characteristics, the symptom can be relieved in a short period of time after giving neostigmine, and the relief time lasts for 3-4 hours; 2, actinic nerve palsy: The motor nerve innervates the levator muscle, when paralysis occurs, it can cause ptosis, but at the same time, it will also be accompanied by eye movement disorders, upward, downward and medial movement will be limited, and there will be pupillary changes, mostly with dilated pupils, and light reflex is weakened or disappeared; 3. Muscle diseases: commonly found in progressive myotonic dystrophy, the patient’s ptosis symptom is persistent, without fluctuation, and it is often accompanied with muscle weakness of the whole body, and it can be found that muscle weakness can be found by checking serum muscle enzyme spectrum, and it can be found that the muscle enzyme spectrum can be found that the muscle is weak. Serum muscle enzyme spectrum can be found muscle enzyme significantly elevated.