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In our whole life we used to face so many situations such as loosing someone we love or suffer a personal tragedy or loss of a job. These kinds of situations make us sad, or caught in a grief. Normally you come out of these difficult situations soon may be with in 2-3 days but if you feel very difficult to come up from these kind of situations or your innerness do not allow you to back in the good scenes of life then you can are in one of Causes of Mental illness that is Depression.
Depression is one of the most common conditions in the developed countries today. It is an illness that involves the body, mood, and thoughts. It affects the way a person eats and sleeps, the way one feels about oneself, and the way one thinks about things. Depression is not the same as a passing blue mood. It is not a sign of personal weakness or a condition that can be willed or wished away. Unfortunately, many people do not recognize that depression is a treatable illness. Without treatment, symptoms can last for weeks, months, or years. Appropriate treatment, however, can help most people who suffer from depression.
Depression can interfere with normal functioning, and frequently causes problems with work, social and family adjustment. It causes pain and suffering not only to those who have a disorder, but also to those who care about them. Serious depression can destroy family life as well as the life of the depressed person.
Research has revealed that depression runs in families and suggests that some people inherit genes that make it more likely for them to get depressed. But not everyone who has the genetic makeup for depression actually gets depression. And many people who have no family history of depression have the condition. So, although genes are one factor, they aren't the single cause of depression.
Life events - for example, the death of a close family member or friend - can go beyond normal grief and can sometimes lead to depression.
Family and social environment also play a role. For some teens, a negative, stressful, or unhappy family atmosphere can affect their self-esteem and lead to depression.
Social conditions like poverty, homelessness, and community violence can make it more likely for people to become depressed.
For some teens, undiagnosed learning disabilities may block school success, hormonal changes may affect mood, or physical illness may present challenges or setbacks. With or without the genetics for depression, any of these can set the stage for depression.
Substance abuse can cause chemical changes in the brain that affect mood - alcohol and some drugs are known to have depressant effects. The negative social and personal consequences of substance abuse can also lead to severe unhappiness and depression.
Certain medical conditions can affect hormone balance and therefore have an effect on mood. Some conditions, such as hypothyroidism, are known to cause a depressed mood in some people. When these medical conditions are diagnosed and treated by a doctor, the depression usually disappears. | 
