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It is a branch of Ayurvedic treatment, which is mainly concerned with the diseases acquired or inherited from apparently unknown causes. This branch of Ayurveda specifically deals with the diseases of mind or psychic conditions, which can be caused by super natural forces or invasion of some evil spirit. Different experts have explained the word bhuta differently. Some experts say that bhuta means ghosts and similar bad spirits who cause abnormal psychological conditions. Others say bhuta represents microscopic organisms such as virus, bacteria that are not visible to naked eye. In modern terminology it can be considered as idiopathic diseases in which the exact cause of disease is unknown. The concept of Ayurveda also believes in the past karma or deeds as a causative factor of certain diseases. Bhuta Vidya deals with the causes, which are directly not visible and have no direct explanation in terms of tridosha. In most cases illness is caused by the disturbance of mind, where rajas (passion) and tamas (ignorance) are supposed to be the contributing factors. These problems can be related to modern psychiatry.
According to Ayurveda, diseases are caused by affliction due to Deva, Asura, Gandharva, Yaksha, Rakshasa, Pitara, Pishacha, Naga and other demons or evil spirit. The exact patho- physiology of these disorders is to be extensively researched. Bhuta Vidya mention use of various disinfectant plants under the title of ‘graha vidya dravya’ for fumigation to make the atmosphere germ free. In addition to this herbs, diet, use of mantras and yogic therapies like meditation and pranavama to pacify the psychological disturbances of a patient. This branch of Ayurvedic science mainly tries to explore the unknown and the hidden facts of particular diseases