Lower eyelid swelling may be associated with thyroid disorders, but other conditions can also cause lower eyelid swelling, such as kidney disease, overuse of the eyes, drinking too much water, and eye diseases. Thyroid disorders such as hypothyroidism and thyroid tumors. Hypothyroidism is caused by decreased secretion of thyroid hormones, which can lead to weight gain, eyelid swelling, fear of cold and other symptoms; thyroid tumors cause compression of the neck veins, resulting in local venous return obstruction, which leads to symptoms of eye swelling. But in addition to thyroid disease, some physiological reasons can also cause eyelid swelling, such as drinking too much water, excessive eye use, improper diet, etc.; some pathological reasons can also cause eyelid swelling, such as anemia, kidney disease, etc.. When eyelid swelling occurs, it is necessary to go to the hospital in time to clarify the cause of the disease before treatment.