What Causes Allergic Reactions

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What Causes Allergic Reactions

More information about What Causes Allergic Reactions:

They are called allergens. During a reaction, your immune system releases antibodies. These are proteins that deliver a message to cells: Stop that substance! The cells then send out histamine, which causes blood vessels to expand, and other chemicals, and these trigger the allergy symptoms. Your immune system is responsible for defending the body against bacteria and viruses. In some cases, your immune system will defend against substances that typically don’t pose a threat to the human body. These substances are known as allergens, and when your body reacts to them, it causes an allergic reaction.

There are many possible causes of an allergic reaction on your face. Food allergies can cause a rash or swelling around the lips. Seasonal allergies in early … Learn about allergic skin reactions and what causes them.

Jump to What Causes an Allergic Reaction? – Most allergic reactions are minor, such as a rash from poison ivy, mosquito or other bug bites, or sneezing from hay fever. The type of reaction depends on the person’s immune system response, which is sometimes unpredictable. In rare cases, an allergic reaction can be life-threatening (known as anaphylaxis). In some severe cases, allergies can trigger a life-threatening reaction known as anaphylaxis. Hay fever, also called allergic rhinitis, can cause:.

Overview. Food allergy is an immune system reaction that occurs soon after eating a certain food. Even a tiny amount of the allergy-causing … Whether it’s runny, itchy or stuffed, your nose knows what’s bothering it. But do you know what’s wrong with your nasal passages? Understanding allergies isn’t …

Allergic reactions are common. The immune response that causes an allergic reaction is similar to the response that causes hay fever. An allergic reaction on the face can cause symptoms, such as red, raised bumps, swollen lips, and wheezing. They are often caused by beauty …