Urticaria is a hypersensitive skin disease related to the immune system, often occurring in patients with allergic constitutions. Urticaria is not contagious, so there is no need to worry about that. The causes of urticaria are mainly related to food, food additives, viral or bacterial infections, medications, and environmental factors such as climate and pollen. Therefore, if urticaria occurs, it is crucial to promptly identify the allergen and actively avoid triggers to prevent its occurrence. If urticaria does occur, it is essential to seek medical advice promptly.