6 doctors weighed in:

What is the typical length of time for an allergic reaction?

6 doctors weighed in
Dr. Steven Machtinger
Internal Medicine - Allergy & Immunology
3 doctors agree

In brief: Depends.

An acute allergic reaction to a food, drug or insect sting begins in a few minutes & lasts 2 to 48 hours.
Pollen, animal dander, dust mite & mold allergies begin in minutes but last as long as exposure continues. For example, ragweed allergy lasts for about a month. Acute contact dermatitis (poison oak/ivy) lasts 1-2 weeks; chronic (nickel) resolves only with removal of the offending agent.

In brief: Depends.

An acute allergic reaction to a food, drug or insect sting begins in a few minutes & lasts 2 to 48 hours.
Pollen, animal dander, dust mite & mold allergies begin in minutes but last as long as exposure continues. For example, ragweed allergy lasts for about a month. Acute contact dermatitis (poison oak/ivy) lasts 1-2 weeks; chronic (nickel) resolves only with removal of the offending agent.
Dr. Steven Machtinger
Dr. Steven Machtinger
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Dr. Jack Mutnick
Internal Medicine - Allergy & Immunology
1 doctor agrees

In brief: Varies

Typically severe reactions occur between 15-120 minutes after exposure but delayed type hypersensitivity reactions can occur from 24-72 hours after exposure and tend to be less severe.

In brief: Varies

Typically severe reactions occur between 15-120 minutes after exposure but delayed type hypersensitivity reactions can occur from 24-72 hours after exposure and tend to be less severe.
Dr. Jack Mutnick
Dr. Jack Mutnick
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