Unfortunately, with depression, it is not completely clear as to the exact causes of depression. However, there are numerous thearies as to the causes such as biological and genetic factors, enviornmental influences, and childhood or developmental events. Generally, it is believed that clinical depression is most often caused by the influence of more than just one or two factors. You have to be willing to understand and recognize that many factors come into play to determine what is causing the depression and what is keeping the person in that state of depression. Many things could be the cause and everything has to be taken into account not only to understand it but try to correct it.

Something important to note, is that the causes of clinical depression are most likely to be different for different people. Meaning that what may be causing depression for patient one most likely is not the same for causing depression in patient 2. Depression is, and will be, unique to each individual, and each individual will experience it differently. That's not to say that there won't be some commonalities, but the experience and specifics will normally differ from person to person.

Also note, that a family history of depression does not necessarily mean that children or other relatives will develop depression. However, those with a family history have slightly higher chances of becoming depressed at some stage in their lives.

Psychological Vulnerability

Personality style, and the way you have learned to deal with problems, may contribute to the onset of depression. If you are the type of person who has a low opinion of yourself and worries a lot, if you are overly dependent on others, if you are a perfectionist and expect too much from yourself or others, or if you tend to hide your feelings, you may be at greater risk of becoming depressed.

Can i return to normal after depression?

Most people are able to return to their previous level of functioning. For people who have suffered severe depressive episodes, or several depressive episodes, recovery can be a much slower process. Setting small, achievable goals, which may be far lower than those you would have set when you were well, will be an important first step in recovery. Professional support can help you develop a graduated plan for returning to work, school or volunteer activities.