Hives and Itching in Adults: Food, Stress or Stings

You finish a shrimp cocktail at a family get-together and, before you even pull into the driveway, your back starts to burn. In the mirror you see raised red patches with pale centers, shaped like little maps. By morning they are gone, yet by mid-afternoon new ones pop up on your arms. Those patches have a name: urticaria, or simply hives. They are very common in adults and almost always fade without a trace, but they are unsettling because they arrive with no warning. In this guide, the clinic's medical team explains how to recognize them, what usually sets them off and the point at which they stop being a nuisance and become an emergency.

What a true hive looks like

Not every itch is urticaria. Hives have a fairly distinctive look:

• They are raised, as if the skin had puffed up from underneath, and they turn white when you press on them with a finger.
• They move around: a single welt seldom lasts longer than a day; it fades and another one shows up somewhere else.
• They itch far more than they hurt.
• They can merge into large patches with uneven edges.
• They leave no scab, dark spot or scar, unless you scratch hard enough to break the skin.

Sometimes the eyelids, lips, hands or feet swell along with the hives. That deeper swelling is called angioedema, and it deserves closer attention, as you will see below.

If what you have looks like pimples with a head, scaly patches or one spot that has itched in the same place for weeks, it is probably not urticaria, and it is worth having it looked at to find out what it is.

Three common causes in adults

The clinic's allergy care page names foods, medications and insect stings as common triggers of allergies with hives. Physical factors and stress round out the picture. This table can help you guess which one is behind yours:

Foods and medications

In adults, shellfish, peanuts, tree nuts and fish are the foods most often behind a reaction, and it can happen even if you have eaten them all your life with no trouble. Medications work the same way: some pain relievers, anti-inflammatories or antibiotics can trigger hives in people who used to tolerate them. Write down what you ate and took in the hours before the outbreak; that list is gold at the visit.

Stress and physical triggers

Many people are surprised to learn that nerves can bring on hives. Stress is rarely the only cause, but it can make existing urticaria worse or make flare-ups more frequent. Some hives also appear with heat and sweat, with cold, with pressure from a purse strap or a belt, or simply from scratching: in that form, running a fingernail across the skin leaves a raised red line that takes a while to settle down.

Stings and bites

In southeast Houston, fire ants are the number one source of stings in the yard, at the park or on outdoor job sites. The usual result is a small itchy blister at the spot. What is not usual is hives breaking out far from the sting a few minutes later, a swollen face or trouble breathing: that signals a whole-body reaction.

When the hives will not go away

When urticaria shows up almost daily for more than six weeks, it is called chronic. In most of those cases no food is to blame, and it is not an allergy that one single test can "uncover." So rather than cutting foods at random, it helps to keep a diary: the time of each flare, what you were doing, what you ate, whether it was hot, whether you had a stressful week or were sick with a cold shortly before.

According to the allergy care page, when symptoms do not respond or last a long time, a referral for skin testing is considered; as general guidance, if hives keep returning for months despite treatment, a specialized evaluation is a good idea.

Calming the itch at home while you wait

• Loose, cool clothing. Friction and heat feed the itch.
• Lukewarm baths, not hot ones, and pat yourself dry instead of rubbing.
• Cold compresses on the itchiest areas, a few minutes at a time.
• Short nails. Scratching opens the skin and invites infection.
• Do not stop on your own a blood pressure, diabetes or other daily medicine because you suspect it caused the hives: bring it to the visit and decide there.

Non-drowsy antihistamines and skin creams are part of the treatment described on the allergy care page, but the right choice depends on your age, other health conditions and what you already take. Ask before combining them.

When scratching leads to infection

A fire ant or mosquito bite scratched for days can become infected. Watch for the area getting redder, warmer and more painful instead of better, for pus, or for a hard lump forming. An infected wound needs cleaning and sometimes antibiotics, which is part of wound care at the clinic. If the bite has turned into a painful pocket of pus that keeps growing, it may be an abscess; in that case, read about abscess drainage.

When it is an emergency

Hives plus any of the following mean you should dial 911 or head straight to the ER:

• Swelling of the lips, tongue, face or throat, a hoarse voice or a feeling that your throat is closing.
• Shortness of breath, wheezing or a cough that will not stop.
• Dizziness, fainting, a racing pulse or confusion.
• Vomiting or strong stomach pain soon after eating something new or after a sting.
• Red skin that spreads fast with a fever, or red streaks moving up from a scratched bite.

If you were ever prescribed an auto-injector for severe reactions, use it as you were taught and call 911 anyway.

What to bring to your visit

Hives have a bad habit of vanishing the moment you walk into the clinic. To make the visit count:

1. A photo of each flare, dated and taken in good light.
2. A list of what you ate and took in the hours before, including supplements, teas and herbal remedies.
3. What you were doing: a workout, outdoor work in the sun, a hot shower, an argument.
4. If it was a sting, where it happened and what kind of insect it was.

During the visit, the medical team examines your skin, asks about possible triggers and puts together a plan to calm the itch and cut down your exposure. Any cream or antihistamine you are prescribed goes out as an e-prescription to whichever pharmacy you pick, so it can be waiting at the counter near your job or on the drive back from Southmore.

For the itch, in 77502

Clínica Hispana Corazón y Vida sees patients in Pasadena, TX 77502, every day, with or without an appointment. The initial consultation is free, so a sleepless night from itching or welts that keep coming back every week are reason enough to come in and have your skin checked. If the hives come with a swollen face or shortness of breath, do not come to the clinic: call 911.

This article is general information and does not replace a personal evaluation.