A mental disorder or mental illness is a psychological or behavioral pattern that occurs in an individual and is thought to cause disability that is not expected as part of normal development. A mental illness may be possibly caused by several factors such as genetics, environment, and chemical imbalances in the brain. It is called mental basically because usually, the illness does not involve much anatomical dysfunctions. Usually, the disorder involves a thinking that something is wrong when physically, it seemed as if nothing is wrong. The symptoms are more internal rather than external. People may think that it is normal for someone to be talking to himself for a while. However, when this symptom last longer, longer than a certain period and disrupts bodily functions, then a mental illness may be diagnosed.

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