Nasyam is a very simple but powerful treatment.
It incorporates face and neck massage followed by steam. Then medicated oil is introduced in the nasal passage in a very specific way to produce maximum effect and bring healing. Nose being the nearest orifice to the brain allows nasya medicines to have strong and immediate effect on the brain and sense organs. It is beneficial in headaches, chronic sinusitis, facial paralysis, acne, cervical spondylosis, frozen shoulder and various allergies.
My theory is that because of its proximity and particular structure, nasal passage allows medicines to cross the blood brain barrier and influence the chemicals responsible for balanced functioning of our physical bodies. It might have positive possibilities for psychological conditions, a topic which needs further research.