Yes.
A person can develop an allergy during adulthood even after years of apparently tolerating a particular food, medication, or other exposure.
That doesn’t mean every new rash or unusual symptom is an allergy. Infections, medications, skin conditions, asthma, and other medical problems can produce similar symptoms.
However, an unexplained or recurrent reaction deserves professional evaluation.
Red Flags That Require Immediate Emergency Help
Seek emergency medical attention immediately if someone develops:
- Difficulty breathing or severe wheezing
- Swelling of the tongue or throat
- Trouble swallowing because of swelling
- Fainting or severe dizziness
- Signs of shock
- Rapidly worsening symptoms after suspected allergen exposure
- A combination of hives or swelling with breathing or circulation problems
You do not need to be completely certain that the reaction is anaphylaxis before seeking emergency help.
When serious symptoms are present, acting promptly is safer than waiting for the reaction to become worse.
What Should You Do During Suspected Anaphylaxis?
1. Use Prescribed Epinephrine Immediately
Epinephrine (adrenaline) is the first-line treatment for anaphylaxis.
If the person has a prescribed epinephrine auto-injector and the symptoms are consistent with anaphylaxis, use it according to the device instructions and the person’s emergency action plan.
Do not delay epinephrine while waiting to see whether severe symptoms improve.
2. Contact Emergency Medical Services
After epinephrine is administered, obtain emergency medical care.
Symptoms can continue, worsen, or return after initially improving, which is why medical assessment is important.
3. Keep the Person in a Safe Position
If possible, keep the person lying down rather than allowing them to suddenly stand or walk.
If breathing is difficult, they may need to sit or remain in a position that makes breathing easier.
If vomiting is occurring, position them safely to reduce the risk of choking.
