Roga Marga — The Three Pathways of Disease
Ayurveda identifies three disease pathways — Bahya (external), Madhyama (middle/vital organs), and Abhyantara (internal/deep) — that determine both prognosis and the appropriate depth and type of treatment.
Roga Marga (literally 'disease pathway') classifies diseases according to where in the body they primarily manifest: Bahya Marga (external pathway — skin, muscles, superficial structures), Madhyama Marga (middle pathway — vital organs: heart, bladder, joints, bones, Marmas), and Abhyantara Marga (internal pathway — digestive and elimination channels). This tripartite classification is clinically important because it determines prognosis and treatment approach: Bahya Marga diseases are generally easier to treat and respond to local therapies; Madhyama Marga diseases affecting vital organs are more serious and require systemic treatment; Abhyantara Marga diseases of the deep channels are the most serious and require the strongest purification before systemic treatment can succeed. The concept anticipates modern medicine's distinction between superficial, systemic, and deep-tissue pathology.
The disease in the external pathway yields easily; in the vital organs it is serious; in the deep channels it is most difficult — know the pathway before choosing treatment.
Clinical staging systems in modern medicine (TNM staging for cancer, CKD staging for renal disease, NYHA classification for heart failure) similarly classify disease by depth and systemic involvement to determine prognosis and guide treatment selection — the same logic underlying Roga Marga classification.
Charaka Samhita