The Possible Trigger Factors Of Urticaria
Urticaria is another word for hives, nettle rash, wheals or welts. People who have this have a skin rash that is itchy, raised and red. Usually, hives are triggered by an allergic reaction to an allergen. The difficult part is determining which allergen a person is allergic too. It will vary from one person to another.
When a person is experiencing an allergic reaction, the human body releases histamine. Because of this, the tiny blood vessels leak fluid, which accumulates in the skin and results to a skin rash. Common trigger factors include food, insect bites, contact with an irritant, medication, sunlight, extreme temperature and water on skin.
The Symptoms Of Hives
The first obvious symptom is wheals that appear as a skin rash. This is pink or red in color and takes a round or oval shape. The size can be a few millimeters to inches in diameter. Wheals are very itchy. The wheals can also be surrounded with red flare. Another symptom is when the wheals come out in batches usually found in the face and extremities like arms and legs.
The wheals can disappear within a few hours but it will be replaced with new wheals. In most cases, the wheals stay from 8 to 12 hours. However, there are cases where the wheals stay for days to months.
What Causes Hives?
In 50% of acute hives cases, the trigger factor is unknown but experts believe that the histamine is causing the skin rashes. The release of histamine in the skin results to an inflammation, which causes the wheals.
As mentioned, trigger factors will vary. Taking aspirin, NSAIDs or antibiotics can trigger an allergic reaction. Certain foods can trigger urticaria. The common foods that can cause allergic reactions are nuts, eggs, wheat products, shellfish, and food additives. Allergic reaction to pets and dust mites can also trigger hives. It will be best to determine what causes your allergies to narrow down the long list of trigger factors.