Pain physicians are allopathy doctors (basically Anaesthesiologists).

They are exceptionally trained to trace the pain pathways in the body & different type of drugs which are more effective for specific type of pain conditions,

They are also specialised in the physical aspect of pain & beyond it : Namely psychological, social, & spiritual aspects of the patient.

A pain in any part of the body if persisting for more than 3 months then it is known as " Chronic Pain". Pain is normal protective function of our body but " Chronic Pain" is a disease.

Pain is not a disease so it has to be controlled & cured at the onset, if it persists for more than 3 months it will become " Chronic Pain" which is a disease state.

It has been observed that that 80 percent of population are suffering from physical pain like Back , Neck pain, headache, entire body pain, stiffness in the morning.

In most cases it is tolerable because people get accustomed to that pain. But in that process ailments like anxiet, high blood pressure & depression sets in.

if neglected this leads to irritation, impediment in work efficiency, abnormal behaviourral changes at home & work palce & rough / rude interpesonal relaationship.

Yes, it is.
It is a separate speciality which has surfaced recently in India & is recognised as 34th specialty in health care system in United States of America (USA)

Pain medicine is a subspeciality of anaesthesia which deals with prevention & treatment of pain & rehabilitation of the patient. Holistic approach to the pain goes long way in the healing process.