In daily life we are more concerned with the sympathetic and parasympathetic .These nervous systems control the impulses ,influxes,transmission of efferent and inferent orders. If there is a any major imbalance in these two lines,there is a real problem .These nervous systems are also responsible for controlling and regulating the endocrine system.
Let us talk about the pancreas,This large gland secretes many fluids,the most important of which is insulin,responsible for balancing in the sugar assimilation . If there is any imbalance in the secretion of insulin, the sugar assimilation is not properly regulated and most of it is expelied . The result is diabetes.
It is the parasympathetic nervous system which is responsible for creating a block in the pancreas. If you overeat and don't do any physical exercise or when you are under constant stress and strain. the parasympathetic nervous system becomes underactive. Its normal functioning is obstructed and as a result.it is unable to send impulses to the pancreas and the pancreas does not produce insulin. If i will be regular yoga partice doing .we will be controll nervous system about disease and that is imbblance in the nervous system 
Htha yoga is a science in which two system in the body are united or connected. These two systems are know as sun and moon ,mind and prana, vital and mental energy ,These are the two energy systems which are responsible for our physical existence.These energies are functioning in each and every part of our body. Hence ,we have lifeforce which is dynamic ,and consciosness in each and every part of our body .Hence ,we have life -force which is dynamic .and consciousness which is static . Whenever there is any imbalance in these two energy levels, these sickness or disease results.
prana means ' vital energy' It is responsible for all the physiological functions of the body. for mobility ,body temperature ,excretion circulation ,respiration ,etc. For all the activities that are taking place in the body,prana,the life force,is responsible .That is one force in you .If that force leaves your body ,you will die.Without prana, there is no metabolism ,ni anabolism,do catabolism .When there is no prana in your body .it is called death.
The other force in the body is mind . through which you think and feel . That force is responsible for knowledge or awareness ,and if you do not have that ,you may be alive ,but you will not know it . In front of you there may be beautiful flowers with a sweet fragrance or something rotten and stinking,but you will not know the difference.You are just alive .There is no consciousness,no perception.
in the science of hatha yoga, a balance between the life principle and the mental principle is paramount. When the mental principle is unbalanced . you have mental diseases born out of the mind . And when the prana principle is unbalanced,you have deseases belonging to the body. The diseases of the mind are know as psychic disease and those of the body as somatic diseases.
A disease may originate from the mind and go into the body. or it may originate in the body and affect the mind. A disease which oroginates in the mind and affects the body is called psychosomatic, A disease which originates in the body and affects the mind is called somatopsychic. No disease is purely somatic or psychic ,either it is born on account of the imbalance of prana or the imbalance of mind . Therefore, in hatha yoga ,what we are trying to do is to creat a balance ,to bring both the energies into a balanced state, and thereby allow healing to take place.
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