Swelling under the eyes may be caused by physiological factors, but also by eye inflammation, kidney disease and other diseases, and it is recommended to consult a doctor if the swelling continues to be unrelieved. 1. Physiological factors: such as too little or too much sleep at night, poor sleep quality, etc., can cause temporary swelling under the eyes, usually after resting the symptoms can be gradually relieved. 2. Ocular inflammation: such as acute dacryocystitis, acute conjunctivitis, blepharitis, etc., patients may also be accompanied by local congestion, redness, swelling, pain and other symptoms, and some patients may also have chills, fever, malaise and other systemic symptoms. 3. Kidney disease: such as glomerulonephritis, nephrotic syndrome, etc., the patient due to sodium retention can appear in the eye edema symptoms, the patient is also accompanied by hematuria, proteinuria and other symptoms. Patients with swelling of the lower part of the eye, the symptoms continue to be unrelieved, or accompanied by other serious discomfort, you should consult a doctor in a timely manner, under the guidance of the doctor to identify the cause of the disease, if necessary, follow the doctor’s instructions for appropriate treatment.