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Many people in the world have allergies.
世界上很多人都有过敏症。
You may even have an allergy.
你甚至可能会过敏。
An allergy is a reaction to a particular substance.
过敏是对某种物质的反应。
Many people are allergic to things such as the yellow pollen dust from flowers and plants, animal hair, or dust.
许多人对诸如花卉和植物的黄色花粉、动物毛发或尘埃等过敏。
When a person is near the substance, he may get a wet nose.
当人接近这种物质时，他可能会流鼻水。
His eyes may become red.
他的眼睛可能会变红。
His skin may itch.
他的皮肤可能会痒。
These are common reactions.
这些都是常见的反应。
Usually allergies like this are not fun to experience.
通常像这样的过敏体验并不有趣。
But they are not usually very dangerous.
但它们通常不是很危险。
For some people allergies can be deadly.
对有些人来说，过敏可能是致命的。
Their body’s reaction is much more serious.
他们身体的反应要严重得多。
They experience anaphylaxis.
他们会出现过敏反应。
Anaphylaxis is a medical term.
过敏反应是一个医学术语。
It is a severe kind of allergic reaction.
这是一种严重的过敏反应。
Many things are signs of anaphylaxis.
很多事情都是过敏反应的征兆。
A person may have trouble breathing.
人可能会呼吸困难。
His brain becomes affected.
他的大脑会受到影响。
He may experience pain in his stomach.
他可能会感到胃痛。
His blood pressure may drop quickly.
他的血压可能会迅速下降。
He may even become unconscious, he appears to be sleeping but he is not.
他甚至可能会失去知觉，他看起来在睡觉，但实际上并没有。
The person’s body thinks that the chemicals from the substance are a dangerous chemical.
人体认为这种物质中的化学物质是一种危险的化学物质。
His body acts against the chemical.
他的身体对这种化学物质起了抵抗作用。
The results can be deadly.
其结果可能是致命的。
But what are some of the things that cause anaphylaxis?
但哪些东西会导致过敏反应呢？
Some of the most common causes for allergic anaphylaxis are foods.
导致过敏反应的一些最常见的原因是食物。
Some people are allergic to nuts, the small hard seeds from trees and plants.
有些人对坚果过敏，坚果是来自树木和植物的小而坚硬的种子。
Other people are allergic to shellfish, animals with hard shells that live in the water.
有些人对贝类过敏，贝类是生活在水中的硬壳动物。
People may also be allergic to foods such as milk, eggs, particular fish, and even to a substance in bread.
人们也可能会对牛奶、鸡蛋、尤其是鱼等食物过敏，甚至对面包中的某种物质过敏。
