Swollen eyelids in the morning are a common occurrence in daily life and can manifest in a variety of ways, occurring in one eye or both eyes, but commonly occurring in both eyes. There are many causes of swollen eyelids. Some common causes are organic eye disease, poor rest and sleep, overexertion, diseases of other organs and systems, or eye surgery the day before. Swollen eyelids in the morning may not always be a pathological condition, but may also be a physiological condition. For example, poor sleep and rest the day before, excessive fatigue, staying up all night, etc., can lead to eyelid swelling in the morning. However, this condition will usually be slowly relieved after local cold compresses and rest. Lesions of the eye itself, such as inflammation of the eyelid, can also cause eyelid swelling. Allergic factors in the eyelid skin or conjunctiva can also cause a similar condition. Lesions of other organ systems throughout the body, most commonly kidney disease and heart disease, can cause swollen eyelids in the morning. Once patients with heart or kidney disease develop eyelid edema, it is important to seek medical attention as soon as possible to identify the cause this morning. In summary, the causes of eyelid swelling in the morning are mainly related to the individual’s constitution, lifestyle habits and the lesion of the eye itself.