How long for a hypersensitivity take to go away?

The duration of a hypersensitivity reaction can vary depending on the individual, the type of hypersensitivity, and the allergen or trigger involved. In some cases, a hypersensitivity reaction may resolve within a few hours or days, while in others it may persist for a longer period of time. Some hypersensitivity reactions, such as anaphylaxis, can be life-threatening and require immediate medical attention.

Here is a general overview of the duration of different types of hypersensitivity reactions:

1. Immediate hypersensitivity (Type I): Immediate hypersensitivity reactions, such as allergic rhinitis (hay fever) or food allergies, typically occur within minutes to hours after exposure to the allergen. Symptoms usually subside within a few hours or days once the allergen is removed.

2. Antibody-mediated hypersensitivity (Type II): Antibody-mediated hypersensitivity reactions, such as transfusion reactions or hemolytic anemia, can develop within minutes to hours after exposure to the antigen. The duration of symptoms depends on the severity of the reaction and the underlying condition.

3. Immune complex hypersensitivity (Type III): Immune complex hypersensitivity reactions, such as serum sickness or Arthus reaction, usually develop within a few days to weeks after exposure to the antigen. Symptoms may persist for several weeks or months.

4. Cell-mediated hypersensitivity (Type IV): Cell-mediated hypersensitivity reactions, such as contact dermatitis or tuberculin skin test, typically develop within 24 to 72 hours after exposure to the antigen. Symptoms may last for several days or weeks.

It's important to note that the duration of a hypersensitivity reaction can vary greatly from person to person and can be influenced by factors such as the individual's immune response, the dose of the allergen, and the route of exposure. If you experience persistent or severe hypersensitivity symptoms, it's recommended to consult with a healthcare professional for proper diagnosis and management.