There are many different causes of headaches, and to make matters more complicated, there are combination headaches of several types.

Few conditions are more annoying than urticaria, better known as hives. Not only can these little welts be uncomfortable and unsightly, they can also be a sign of a more serious medical condition. Fortunately, most cases of urticaria are benign and are usually caused by allergy. The allergens can be inhaled through the nose, ingested as food, grow on the body as yeast, or make contact with the skin. Non-allergic causes or serious medical causes must be worked up independently