Symptom guide
Allergy
Symptoms after exposure to a trigger such as pollen or food.
Important: Some warning signs listed below can be emergencies. Get urgent help immediately if they are present.
About this symptom
Allergies can cause sneezing, itchy eyes, rashes, or digestive symptoms. Reactions vary widely, so identifying triggers and warning signs is important.
Common causes
- Pollen, dust, or animal dander
- Certain foods
- Insect stings
- Medicines or skin products
Gentle self-care
- Avoid known triggers where possible.
- Keep a note of what was present before symptoms began.
- Use cool compresses for mild itchy skin if helpful.
When to seek medical care
- Swelling of the lips, tongue, or throat; wheezing; trouble breathing; or collapse — call emergency services.
- A widespread rash with fever or blistering.
- New, recurring, or troublesome reactions should be reviewed.