Waking up in the morning and finding swollen eyes can be caused by many reasons. If there is no abnormality inside the eyes, but both upper eyelids have obvious edema and often recurring episodes, you need to highly suspect that it is caused by systemic diseases, such as kidney disease, heart disease, anemia, and you need to hurry to the internal medicine department of the hospital for a detailed examination. If there is localized redness, swelling and pain in the eyelids, it is considered to be caused by blepharitis, which is a bacterial infection that leads to inflammatory reaction of the eyelid glands of the eyelids. If the eyelids appear red, swollen and itchy, it is considered to be caused by allergy, in addition to the eyelid skin with this symptom, may be other parts of the skin tissue may also appear similar symptoms. If there is obvious redness, swelling and pain as well as increased secretion inside the eyes, it may be caused by acute conjunctivitis or keratitis.