Hives Support Group
Hives is a relatively common form of allergic reaction that causes raised red skin welts. These welts can range in diameter from 5 mm (0.2 inches) or more, itch severely, and often have a pale border. Urticaria is generally caused by direct contact with an allergenic substance, or an immune response to food or some other allergen. Hives can also be caused by stress.
For me it would be say I am using a screw driver and I need to apply force to thru the handle... next day I would get a swollen hand.
You can try to eliminate foods that cause high histamine in your body.