The presence of swollen lips in urticaria is actually a manifestation of giant urticaria, or angioedema. The difference between giant urticaria and common urticaria is that common urticaria is generalized, while giant urticaria is limited. The symptoms of common urticaria are large, generalized bumps, but angioedema is confined to one area, such as the lips, eyelids, or mucous membranes. This kind of giant urticaria is an allergy of deep subcutaneous tissue, which is different from ordinary urticaria, such as swollen lips like sausages after eating mangoes, or swollen eyes after waking up from sleep, which are all manifestations of angioedema, so the appearance of swollen lips in urticaria is a manifestation of a special type of urticaria.