Comparison
The third pramana — knowledge gained by perceiving similarity between the description of an unfamiliar object and something already known.
Upamana: Knowledge through Comparison
Upamana relies upon comparison — a kind of knowledge that comes when one perceives the similarity between the description of an unfamiliar object and something already known. Doctors compare disease processes and pathological conditions as one way of understanding.
Ayurveda uses comparison to understand different diseases in terms of their doshas. For instance, a pitta-type cold will show thin, yellow mucus, a sore throat, and fever, while a kapha-type cold will present thick, white, copious mucus, chest and bronchial congestion, and chills. By comparing these presentations, the practitioner can determine the underlying doshic imbalance and choose appropriate treatment.
Source: Textbook of Ayurveda: Fundamental Principles, Chapter One: Shad Darshan (Six Philosophies of Life)
Medical Disclaimer: The information on this page is for educational purposes only and is not intended as medical advice. Ayurvedic treatments should be pursued under the guidance of a qualified practitioner (BAMS/MD Ayurveda). Always consult your healthcare provider before starting any new treatment. Content is sourced from classical Ayurvedic texts and may not reflect the latest medical research.