When you get up in the morning and your eyes appear swollen, it may be due to the following reasons: First, elevated intraocular pressure. You need to go to an eye clinic to measure the intraocular pressure, the normal value is 10-21 mmHg. If it is higher than the normal intraocular pressure, you need to ask your ophthalmologist to examine it carefully to rule out glaucoma disease. Second, physiologic edema of the eyelids. This condition is usually accompanied by swelling elsewhere on the face in addition to swelling of the eyelids. Third, if the eyelid has allergic symptoms, such as allergic dermatitis due to the use of facial or eyelid cosmetics or contact with other substances, the swelling will soon subside with the application of anti-allergy medication.