Thyroid nodules by themselves usually do not cause eyelid swelling, but when combined with thyroid function abnormalities, eyelid swelling may occur, and thyroid function tests are needed to confirm the diagnosis. Common thyroid function abnormalities include hypothyroidism and hyperthyroidism, and it is recommended to consult a doctor for further examination when eyelid swelling occurs. Thyroid nodules can be benign or malignant. Simple thyroid nodules by themselves usually do not cause eyelid swelling, but if they are benign, they need to be reviewed regularly and can be treated surgically if necessary; if they are malignant, they usually need to be treated surgically as soon as possible. If thyroid nodules are combined with abnormal thyroid function, they may cause eyelid swelling. For example, in hypothyroidism, there may be fatigue, fear of cold, loss of appetite, swelling of the face and eyelids, and other discomforts. Seek medical attention if you feel unwell.