Abnormal Behaviour is characterized by an abnormality in the actual/original behaviour of individual. Behaviour disorders include anxiety disorders, disruptive behavioural disorders, dissociative disorders, emotional disorders and pervasive development disorders. Behavioural disorders are commonly noted in children and adults. It is associated with biological, family or school related factors in the affected. Biological cause of Behavioural Disorders is due to disability, malnutrition, hereditary factors, and brain damage. In some case family matters like divorce of parents, or lack of proper attention from parents can be the cause of such behaviour. The symptoms of behavioural disorders vary according to the age and the type of disorder. It can be difficulty in concentrating, consistent anxiety and frustration, lacking problem solving skills, lack of empathy, consistent negative thoughts, low self-esteem, irritation, revenge attitude and social isolation. Behavioural disorders mostly exhibit emotional symptoms along with fever, headache etc. People with behavioural disorder have to undergo serious medication to get rid of the state otherwise it may affect their personal and professional life. Psychologists or mental health analyst can easily analyse using functional behavioural assessment. Research studies prove that hormonal imbalance is one of the factors facilitating behavioural disorder. Medications to balance hormones can reduce the such disorders to a great extent. In some cases mood altering therapy will be helpful to treat anxiety disorder, panic disorder and bipolar disorder. Even talk therapy with professional communicators will help to reduce the disorders or alterations in the normal behaviour.