Sanskrit Verse
त्रयो रोगमार्गाः - शाखा, मर्मास्थिसन्धयः, कोष्ठश्च।
— (Charaka Samhita, Sutrasthana 11/48)
Explanation
The Roga Marga are the three main pathways or tracts where diseases can manifest. They are: 1. Shakha (External pathway: peripheral tissues like Rasa, Rakta, and skin), 2. Marma-Asthi-Sandhi (Middle pathway: vital points, bones, and joints), and 3. Koshtha (Internal pathway: the central visceral organs of the torso).
Clinical Importance
Identifying the Roga Marga helps determine the prognosis and treatment strategy. Diseases in the Shakha marga (like a skin rash) are generally easier to treat. Diseases in the Koshtha are of moderate difficulty, while those in the Marma-Asthi-Sandhi marga are considered the most difficult to cure.