Women have urticaria almost twice as often as men. There are two types of urticaria, defined by how long the attacks last and how often they occur. In cases of acute urticaria, the cause often can be identified. If you have hives, it is important to discuss with your dermatologist all the products you have been using in order to help the dermatologist determine the cause. Infections can also cause hives.
Respiratory infections caused by viruses are a common cause of hives in children.
Other viral, bacterial, or fungal infections can also cause hives. Examples include infections of the sinuses, dental infections, and athlete's foot. In cases of chronic urticaria, the cause is much more difficult to determine. Very often, it is never identified. Chronic urticaria caused by foods is more common in children than in adults.