Swollen eyes in the morning may be due to physiological reasons, or pathological reasons, such as eye diseases, kidney diseases, heart diseases, etc.. 1. Physiological reasons: swollen eyes in the morning is mostly due to poor night sleep, or sleep pillow is too low, too fatigue and other physiological factors, thus affecting the facial blood reflux. This kind of eye edema is mostly seen in healthy people, and it can subside naturally. 2. Eye diseases: such as blepharitis, acute conjunctivitis, etc., in addition to the morning eye swelling, but also can be complicated by local heat, redness, pain and other symptoms. 3. Kidney diseases: such as nephrotic syndrome, which can lead to sodium retention in the body, resulting in edema in the eyes, which can also be accompanied by lower back pain, fatigue and other symptoms. 4. Heart disease: such as heart failure, etc., due to the cardiac insufficiency of such patients, resulting in poor peripheral blood return, will make the surrounding tissues edema, such as eye swelling. Swollen eyes in the morning, recurring, after improving the work and rest after no relief, should be timely to the hospital to identify the cause of the disease, targeted treatment.