Types of Allergic Reactions
Allergic reactions can be different every time you come into contact with something you’re allergic to. Some reactions happen right away, while others might take longer to show up. There are two types of allergy reactions to know about.
Acute Response (Immediate Reaction)
This is the type of allergy reaction most people are familiar with. It happens within 15-30 minutes of contact with the allergen. During this time, the body releases chemicals like histamine, prostaglandins, and leukotrienes, which cause the body to react. For example, these chemicals can cause symptoms like sneezing, swelling, and mucus production in the respiratory system. These reactions can also cause a blocked nose and difficulty breathing, leading to symptoms like wheezing.
Late-Phase Response (Delayed Reaction)
This happens 4-6 hours after the first symptoms go away and can last for days or weeks. In this phase, the immune system causes inflammation and damage to tissues in the body. This can lead to more swelling, edema, and difficulty breathing in the lungs. This delayed reaction is why it can take time for symptoms to show up and worsen.