List of what causes urticaria and conditions for which urticaria symptoms are related. If you want to know, "Why do I have urticaria?" consider that urticaria can be caused by a number of illnesses. This is a list of diseases that urticaria is a symptom of, including diseases associated with urticaria. What diseases cause urticaria? This is a list that features items like Stevens-Johnson syndrome and Eczema. This list of diseases with urticaria as a symptom is in alphabetical order with images when available, though it can also be sorted. If you could say "I am experiencing urticaria," please consult a physician.