There are a number of conditions that can cause this. Sometimes the muscle that holds your eyelid open rips and your lid becomes droopy and hard to open. When this occurs, if you were to look in the mirror or ask a friend, you might see that you are arching your eyebrows up in an effort to use your forehead muscles to lift your eyelid. To treat this condition surgery is needed to reattach the ripped muscle.
Other causes include viral infections, nerve inflammation, MS, muscular dystrophy, medicines/drugs, etc. The list can get rather extensive.
A complete exam by an ophthalmologist
should be able to get to the root cause of your symptoms.
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