A large percentage of diseases are caused by disruptions and disturbances within the pranic body and mind. Nadi shodhana pranayama, especially when it incorporates antar kumbhaka, is a powerful and direct method of bringing about harmony into these areas. As such when one approaches antar kumbhaka practice sensibly and avoids adverse reactions, it can have a wonderful influence on preventing and removing a wide variety of diseases. It is especially effective in tackling the more obvious psychosomatic disorders such as asthma, diabetes, etc. for it results in stillness and peace of mind.
The practice of antar kumbhaka is excellent for the mind. It is a great aid in introducing clear thought and concentration. We therefore highly recommend kumbhaka for those who are engaged in a lot of mental work and who require mental and physical vitality.
Pranayama, especially kumbhaka, helps to eradicate impurities from the body. This is clearly stated in the quotation that we have already given from Hatha Yoga Pradipika. Our body is continually throwing out impurities from itself. Because of bad eating habits, emotional stress, inefficiency of internal organs, etc., the purification process becomes inadequate. This results in the accumulation of waste products and in disease of one form or another. Pranayama, especially kumbhaka, aids this purification process and thereby is a great help in attaining the best possible health. So swift is this purification that occasionally the body manifests sores etc. to cope with the extra elimination of poisons. This is partly the reason for the so-called adverse reactions of this type.