Urticaria
Why Hives Appear and What Triggers Them
Urticaria, commonly known as hives, is a skin condition characterized by raised, itchy welts that can appear suddenly and disappear just as quickly. The rash may affect a small area or spread across the entire body. Individual welts typically last less than 24 hours, but new ones can continue to appear.
What Is Urticaria?
Urticaria occurs when certain cells in the skin release histamine and other inflammatory chemicals. This leads to swelling in the upper layers of the skin, producing red or skin colored raised areas known as wheals.
The condition may occur alone or alongside deeper swelling called angioedema, which commonly affects the lips, eyelids, hands, feet, or throat.
Types of Urticaria
Acute Urticaria
Lasts less than six weeks. Often triggered by infections, foods, medications, or insect stings. Most episodes resolve within days to a few weeks.
Chronic Urticaria
Occurs most days of the week for more than six weeks. The cause is often not identified. Symptoms may persist for months or even years.
Physical Urticaria
Triggered by specific physical factors such as pressure, heat or cold sun exposure, exercise, and water contact.
Cholinergic Urticaria
Triggered by increased body temperature from exercise, hot showers, stress, or sweating.
Lindsey Forstie, FNP and the Perspective Behind Urticaria Care
Lindsey’s understanding of chronic hives and urticaria is shaped by her early experience with overlooked inflammatory symptoms. As a child, she lived with undiagnosed asthma and learned how frustrating it can be when symptoms are minimized or misunderstood. That perspective influences how she approaches patients with recurrent hives, swelling, or unexplained skin reactions. Urticaria is not dismissed as simply stress or sensitive skin. It is evaluated carefully to identify underlying triggers and patterns.
After becoming a nurse and later a board certified family nurse practitioner specializing in allergy and immunology, Lindsey founded Carefree Allergy with a clear mission: no one should have to live with persistent, unexplained symptoms. She combines evidence based medicine with thoughtful, individualized care to help patients move beyond temporary relief toward long term stability and confidence in managing their skin health.
Board-Certified Provider
Licensed in Arizona
10+ Years Experience
Telehealth Statewide
Diagnosis and Treatment
Diagnosis
Urticaria is usually diagnosed based on medical history and physical examination. If symptoms are persistent or recurrent, further evaluation may be recommended. Testing may include:
- Allergy testing if a food or medication trigger is suspected
- Blood work in chronic cases to rule out underlying conditions
- Rarely, skin biopsy if another condition is suspected
Treatment
Treatment focuses on symptom control and trigger avoidance when possible.
First line therapy:
- Non sedating antihistamines
If symptoms persist:
- Increased antihistamine dosing under medical supervision
- Short course of corticosteroids for severe flares
- Leukotriene modifiers
- Biologic medications such as omalizumab in chronic cases
Take the Next Step
If you are experiencing recurrent hives, persistent itching, or unexplained swelling, a thorough evaluation can help determine the underlying cause and guide effective treatment.
Schedule a consultation to develop a personalized plan for symptom control and long term relief.
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What Our Patients Say
Real stories from real people who found relief
SMSarah Mitchell
Arizona
Seasonal Allergies
★★★★★
After years of struggling with allergies, I finally found relief! The allergy drops are so convenient, and I’m no longer dependent on daily medications.
JRJames Rodriguez
Arizona
Food Allergies
★★★★★
The testing was quick and thorough. Knowing exactly what I’m allergic to has completely changed how I manage my symptoms. Highly recommend!
ECEmily Chen
Arizona
Asthma & Allergies
★★★★★
Lindsey is amazing! She took the time to understand my unique situation and created a treatment plan that actually works. I can breathe easy again!
What Can Cause Hives to Flare
In some cases, the cause is clear. In others, no trigger is identified. Common triggers include:
- Foods such as peanuts, tree nuts, shellfish, or eggs
- Medications including antibiotics, aspirin, and NSAIDs
- Viral or bacterial infections
- Insect stings or bites
- Latex
- Pet dander or pollen
- Temperature changes
- Emotional stress
- Pressure from tight clothing
- Chronic urticaria often has no identifiable allergic trigger.
Common Signs of Urticaria
Urticaria symptoms may vary in intensity and duration. Common features include:
- Raised, red or skin colored welts
- Intense itching
- Lesions that move from one area to another
- Blanching when pressed (the center turns white)
- Swelling of lips, eyelids, hands, or throat in some cases
Each individual welt typically resolves within 24 hours without leaving marks, although new lesions may continue to develop. Seek urgent care if swelling affects breathing or swallowing.
Common Questions
Are hives always caused by allergies?
No. While allergies can trigger hives, many cases, especially chronic urticaria, are not caused by identifiable allergic reactions.
How long do hives last?
Acute hives typically resolve within days to weeks. Chronic urticaria lasts more than six weeks and may persist for months or years.
Can stress cause hives?
Yes. Emotional stress can worsen or trigger episodes in some individuals.
What is the difference between hives and angioedema?
Hives affect the surface of the skin and appear as raised welts. Angioedema involves deeper swelling beneath the skin, often around the eyes, lips, or throat.
When should I seek emergency care?
Seek immediate medical attention if you experience difficulty breathing, throat swelling, dizziness, or fainting, as these may be signs of a severe allergic reaction.