What are Hives (Urticaria)?
Hives, also called urticaria, are red or pink, itchy swellings (wheals) that develop on the skin. These raised patches usually appear suddenly and can last from a few minutes to several hours before fading without leaving any marks. Hives can be either acute (lasting less than six weeks) or chronic (lasting longer than six weeks). Common symptoms include raised, itchy bumps, redness, and sometimes swelling. In more severe cases, angioedema can occur, which involves swelling around areas like the eyes and lips.
Common Triggers of Hives
Chronic spontaneous urticaria is mainly idiopathic (cause unknown). Hives can be triggered by various factors, and recognising these triggers helps manage and prevent outbreaks. Here are some common triggers for hives:
Allergic Reactions
Hives are frequently caused by allergic reactions to substances such as certain foods, insect bites, or pollen. Common allergens include peanuts, shellfish, eggs, and pollen. Exposure to these allergens can lead to a rapid immune response, causing itchy, raised bumps to form on the skin.
Medications
Some drugs, such as aspirin, ibuprofen, and certain antibiotics, can trigger hives in individuals with sensitivities. These reactions can occur shortly after taking the medication or even after a longer period of use.
Infections
Infections, such as colds or respiratory illnesses, are a common cause of acute hives, particularly in children. The hives typically resolve once the infection subsides. Hives themselves are not contagious, even if triggered by an infection.
Environmental Factors
Physical triggers like exposure to heat, cold, sunlight, or pressure from water can provoke hives in sensitive individuals. These physical stimuli can cause the release of histamine, leading to the formation of hives on the skin.
Stress
Stress and anxiety are known to worsen chronic hives. Emotional stress can trigger an immune response that leads to hives, particularly in individuals with underlying conditions or a history of recurring outbreaks.
Systemic Association
Chronic spontaneous urticaria has also been associated with: chronic underlying infection, such as Helicobacter pylori (bowel parasites), cChronic autoimmune diseases, such as systemic lupus erythematosus, thyroid disease, vitiligo, and others.
Diagnosing Hives
Diagnosis of hives involves a physical examination and a review of the patient’s medical history to identify potential triggers, such as allergens or environmental factors. If an allergic cause is suspected, dermatologists may recommend additional tests like a skin prick test, which exposes the skin to small amounts of allergens to observe reactions, or blood tests to detect elevated IgE antibodies, helping to pinpoint underlying conditions.
Managing and Preventing Hives
Managing and preventing hives involves identifying and avoiding specific triggers like allergens and physical stimuli, using medications such as oral antihistamines or prescribed corticosteroids for more severe cases, and making lifestyle adjustments like managing stress, moisturising the skin, and using protective clothing to minimise flare-ups caused by environmental factors. In recalcitrant cases despite regular antihistamines, oral immunosuppressants or biologic injection such as Omalizumab can be considered to better manage the frequent flares.
Conclusion
Hives, although often harmless, can cause discomfort and may become chronic if not properly managed. By identifying and avoiding triggers, using appropriate medications, and making lifestyle adjustments, many individuals can effectively control their symptoms. For persistent or severe outbreaks, consulting a qualified dermatologist ensures a personalised approach to treatment and long-term management.
