Every time you cat seafood，you get red spots（紅點(diǎn)）on your body.And every spring and fall，your friend gets a runny nose when you play in the garden.What's going on？Well，you and your friend may have allergies（過敏）.
   An allergy is a reaction from your immune system（免疫系統(tǒng)）.The immune system keeps you away from diseases by fighting germs（細(xì)菌）.But when you have allergies，it overreacts（過度反應(yīng)）and tries to fight against things like grass，pollen or some foods.This makes your body feel uncomfortable.
   Allergies are common around the world.According to the WHO，about 20 percent of the world's population suffers from allergies.
   Food allergies are one of the most common types.Many children can be allergic to food like milk，eggs and peanuts.If you are allergic to certain foods，you may get red spots，an upset stomach or even have difficulty breathing.So far，people haven't found any good ways to stop food allergies.Just do not eat those foods as much as possible.
   Seasonal allergies happen in most parts of the world.So how do you know if you are allergic to something？Skin（皮膚）tests are the most widely used way.

（1）What is an allergy？

An allergy is a reaction from your immune system.

An allergy is a reaction from your immune system.

（2）What may happen when you have allergics？

When you have allergies，it overreacts and tries to fight against things like grass，pollen or some foods.

When you have allergies，it overreacts and tries to fight against things like grass，pollen or some foods.

（3）What food can make many children be allergic to？

Milk，eggs and peanuts.

Milk，eggs and peanuts.

（4）Have people found any good ways to stop food allergies？

No.

No.

（5）How do we know if we are allergic to something？

We can use skin tests.

We can use skin tests.