感染-如感冒或流感的病毒感染是一种常见的原因。
Infections - a viral infection such as the cold or flu is a common cause.
每个人都会生病的，如感冒，发烧，咳嗽，糖尿病等。
Everyone will get ill, such as catch a cold, have a fever, cough, sugar diabetes and so on.
感冒症状，如鼻塞、流鼻涕和喉咙发痒，通常是逐渐出现的，成年人和青少年通常不发烧。
Cold symptoms such as stuffy nose, runny nose and scratchy throat typically develop gradually, and adults and teens often do not get a fever.
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