It's important to avoid anything that may worsen urticaria, such as heat, tight clothes, alcohol and asprin and, if possible other similar medicines such as Nurofen (paracetamol doesn't usually cause a problem).

Medicines called ACE inhibitors (often used to treat high blood pressure) should be avoided, especially if angio-oedema is present. Foods, colouring agents and preservatives can be avoided in the rare instances where these have proved to be a problem.
Nina Goad of the British Association of Dermatologists