Grah chikitsa also known as bhoot vaidhya. Many authors and vaidya have many definitions of this field of Ayurveda. Conclusively a branch of Ayurveda in which we treatment of mental diseases is mainly done by methods such as stringing, herbal smoke, hitting, injecting drugs into nose, correcting emotions, eradicating illusions, misbeliefs, and focusing on calmness to the mind and soul take place known as grah chikitsa (bhoot vidhya). In modern medical science, it is known as psychotherapy.
Shalya tantra-
Maharishi Sushrut, the Father of Indian Medicine” and “Father of Plastic Surgery. On the topic of shalya-tantra, we are talking about Maharshi sushrut because basically, he had introduced this branch of Ayurveda to the world. The branch of Ayurveda in which we treats and manage injuries and diseases by operative procedures comes under the branch of Shalya tantra. Maharshi Sushruta had written Sushruta Samhita in the 5th century B.C. It would not be an exaggeration to say that without his studies and contributed to surgical medicinal science we wouldn’t be able to imagine this modern surgical medicinal science. He had introduced uses of yantra, kshar, Agni(fire), shastra(weapon), and Padya.
Reference
Ajay Jadhav