Computers are wonderful machines. The Internet is also wonderful. But some people spend too much time online. They can’t stop. Doctors say this is a new illness called Internet Addiction Disorder (互联网成瘾症).

People with IAD are online a lot. They spend many hours chatting with their friends or playing games online. Many people with IAD spend more time surfing the Internet than staying with their family or friends. Some people with IAD even give up their jobs!

Do you have IAD? Think about the following questions carefully: How many hours a day are you online? When you are not online, do you want to play computer games or check your messages? When you are online, do you often lose track of time? Do you get angry when you can’t play computer games?

If you have IAD, what should you do? Dr. Ivan Goldberg and Dr. Kimberly S. Young give some advice. First, ask yourself, “Why am I online a lot? Then try to take a break. For example, use the computer or play computer games twice a week, not every day. In this way, you can spend more time with your family or friends.

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Being sad or in a low mood is a normal (正常的) part of life. Many people feel down from time to time. For example, when people face challenging events in their lives, such as financial(经济的) difficulty or major changes, it’s common to feel down. But in most cases the bad feelings slowly disappear.

As for depression(抑郁症), however, the bad mood lasts for weeks, months, or even longer because it is a mental(精神的) illness. As the World Health Organization(WHO) noted, depression is a mood disorder. It shows in different ways, including loss of interest in normal activities and feelings of low self-worth. It often lasts for a long time and greatly harms a person’s ability at work or school or in the daily life. People with depression usually don’t like to talk about their problems with others. More seriously, depression may even lead to the act of killing oneself.

“Depression is not just a bout(一阵) of sadness or a sign of weakness, and you can’t just simply stop feeling depressed.” said the health news website www.mayoclinie.com.

But depression is not a person’s problem. It’s also more common than most people think. It is hurting about 280 million people around the world, according to WHO.

Though depression is worrying, we don’t have to be afraid of it. Depression can be treated by getting professional(专业的) help, taking medicine or a mixed treatment of both. In fact, when you begin to feel the danger of depression, you can try to deal with it early by yourself. Listening to music, doing some sports and drawing some pictures might help you feel better. Another useful way is talk therapy. When we are attacked by a low mood, having a conversation with others is of great help. Being honest about how we feel does not make us weak, it makes us human.