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Hives frequently occur following an infection or as a result of an allergic reaction such as to medication, insect bites, or food. Psychological stress, cold temperature, or vibration may also be a trigger. In half of cases the cause remains unknown. Risk factors include having conditions such as hay fever or asthma.
Different medical reasons can cause hives to show up. Certain medications may lead some people to have allergic reactions that include such a rash. Some foods also produce such a response in individuals with allergies to them. Nuts, shellfish, soy, wheat, and eggs are some of the possibilities.Certain bacteria might also cause hives in a patient.rticaria is another name that is used for this medical condition. Symptoms. The characteristic symptom in hives is the rash that appears. However, other symptoms may appear, especially due to any underlying medical conditions that led to the appearance of the urticaria.