If the hives and vomiting seem to come out of nowhere the likely cause allergic reaction. In normal cases of hives, vomiting is not also present. An anaphylactic reaction, however can present urticaria, vomiting, and other symptoms all at once. In these cases, the symptoms come on quickly and then disappear just as quickly. Shortness of breath or any difficulty breathing can indicate a more serious reaction called anaphylaxis. Anaphylaxis is a medical emergency and requires immediate attention.

Chronic Hives and Vomiting

When you are breaking out in hives, vomiting, and itching all over, the most common thought is that you are having an allergic reaction. While this could be the case, in reality chronic hives are more often caused by a virus or an infection. And with viral hives, vomiting is actually quite common.

Don’t forget that hives are an immune system response and the immune system does respond to hives. Especially in toddlers and children hives, vomiting, and a fever is an indication that the immune system is trying to get rid of a virus or other infection. The immune system releases histamine in an attempt to fight the virus, and that is the cause of the urticaria. Vomiting is a common symptom of many viral infections, and will usually subside after a day or two. The hives are extremely itchy, and often remain after the vomiting has stopped. Try some antihistamine medication, either oral or in an ointment. If the fever gets high or the throat begins to swell, medical attention should be sought right away.

Infection can Cause Symptoms of Urticaria, Vomiting and Fever

The immune system responds to infections the same way it does to a virus.  Hives, vomiting, and other symptoms appear identically in both cases, and are equally bothersome. But with infection induced hives, the symptoms usually appear after the body begins to clear the infection. Even a common cold can cause these symptoms. The vomiting won’t last long in this case, but the hives may last for a couple weeks, and in some cases become chronic. Again, an antihistamine will help alleviate the hives. But a more natural approach is better for chronic cases of urticaria. Vomiting does not become chronic; therefore almost anyone can deal with it for a few days, with dehydration being the main concern. But chronic hives can last for years, and being on steroids or antihistamines for that length of time isn’t good for anyone.