WHO defines mental health as follows: "Mental health is the foundation for the well-being and effective functioning of individuals. It is more than the absence of a mental disorder; it is the ability to think, learn, and understand one's emotions and the reactions of others. Mental health is a state of balance, both within and with the environment. Physical, psychological, social, cultural, spiritual and other interrelated factors participate in producing this balance. There are inseparable links between mental and physical health."