Definition of health and mental health
The definition of health encompasses a few spheres - physical, mental, social and spiritual. We may then talk about full health when all of the mentioned spheres demonstrate well-being. Mental health is an important health element in general and, although, taking into account its ambiguity and vagueness, there is no one obligatory definition of mental health, its importance is still emphasised by the majority of approaches to health meaning.
We most often understand health as the absence of disease and feeling no pain. It is, however, good to remember that some sensations may occur in man not necessarily in result of a disease.
On the other hand, the lack of sensations does not exclude the presence of disease in our body, which can be identified only during accurate medical examination and, very often, by additional studies (laboratory tests, x-ray or sonographic imaging).
Therefore, the present definition describes health as "the lack of disease or disability with simultaneous full mental, physical and social well-being" (a definition of the World Health Organisation - WHO).
Health is also often understood as the man's ability to achieve the limits of their own physical, mental and social potential and abilities, as well as of positive reactions to any challenges. We say that somebody has good health when he/she has big energy and resistance resources, enabling the person to maintain the systemic balance and resistance to falling ill, even under large physical (heavy work) and mental (factors of psychosocial stress) burden and in unfavourable environmental conditions (weather changes, difficult living conditions, interpersonal conflicts).
What is interesting, some people try to check their health resources even in extreme conditions, such as survival schools, rock climbing or sporting achievements.