Since the inception in 1946 of the World Health Organization (WHO), its Member States have always considered mental well-being as an integral part of the general definition of health. In the Preamble to the WHO Constitution, health has been defined as "a state of complete physical, mental and social well-being and not merely the absence of disease or infirmity".

Mood (affective) Disorders

which affect around 340 million people worldwide at any given time. They are characterized by a change in mood, which a person cannot control, to depression or elation. Such disorders typically take the form of either bipolar affective disorders or unipolar depressive disorders.

The diagnosis of dyslexia usually begins with an awareness by parents or teachers that a problem in reading exists. A physician is often the first diagnostician to explore the nature of the difficulty. The medical practitioner should investigate the cause of the reading problem by conducting a complete physical examination and obtaining a comprehensive health history. If indicated, the child should be referred for a neurological examination.