Swollen eyes may be due to physiological factors, such as drinking too much water, etc., or pathological factors, such as allergic factors, eye infections, systemic diseases and so on. 1. Physiological factors: such as excessive water intake leads to fluid retention in the body, which can cause swelling of the eyelids; in addition, lack of sleep, improper sleeping posture, which affects the reflux of fluids in the face, can also lead to the performance of swollen eyes. 2. Allergic factors: when the patient is allergic, in contact with pollen, dust mites and other factors, the symptoms of eye allergy can occur, manifested as red and swollen eyes, accompanied by itching, generalized allergies and other manifestations. 3. Eye infections: Bacterial infections in the eye, such as blepharitis, dacryocystitis, dacryoadenitis and other diseases, can lead to swelling of the eyes, accompanied by pain and swelling of the eyes. 4. Systemic diseases: such as kidney disease, hypothyroidism and other systemic diseases. Nephritis or nephrotic syndrome leads to sodium retention in the body, resulting in edema of the eyelids and face; hypothyroidism can cause mucous edema, which can also lead to swelling of the eyes, as well as facial and limb areas of non-sunken edema. In short, if the swelling of the eyes can not be relieved by resting, you should go to the hospital in time to get a clear diagnosis and under the guidance of the doctor for treatment.