Mechanism of pain (Vedana) in Ayurveda
The term ‘Vedana’ (Samvedo Vedana) is pain, stimuli or sensation. This is a subjective feeling with synonym Ruja, peeda, Dukh, Shool. The strength of pain varies from person to person, period to period, and site to site. Pain, predominantly caused by Vatadosha and it is a pathological symptom. It is significantly influenced by the sensitivity of the mind. In Vataja Prakriti patients and individuals with Vata vitiation, the dominance of pain sensation is observed.[16]
Among the Tridosha, vitiated Vata Dosha, is responsible for primary causative factor for all pain conditions. The appearance of pain is significantly influenced by Vata's Rooksha and Chala Guna. The nature and characteristics of pain is based on the associated Dosha with Vata. The manifestation of Vedana varies in the body due to the different expressions of Vata associated with Kapha and Pitta.[16]
Sites of Vedana / Pain
The manifestation of health/happiness (Sukh) and disease (Pain/Vedana) primarily occurs in the sense organs, which are considered the most important sites. In Ayurveda the origin, nature, and classification of pain is very deeply described. The term "Shoola" is applied to represent painful sensation. Shoola is not regarded as a symptom or an independent disease entity in Ayurveda, but a more comprehensive perception is taken regarding the etiopathology and management of pain. Shoola is described as the outcome of Vata Vyadhi.
The involvement of Vata is considered essential for the presence of pain (Shoola), as stated in Sushrut Samhita.[17] However, both Pitta and Kapha influence the nature and intensity of pain. Therefore, all three Doshas (Vata, Pitta, and Kapha) collectively bear responsibility for the origin, development, and perspective of Pain.[17] Shoola is described by Susruta as 'शंकुवत स्फुटन तीव्र वेदना'. Focal symptoms in the body are produced by Shoola. In Stree Roga, Shoola in the Yoni (reproductive system) is considered a symptom of Vatala Yoni. Thus, it is manifest that in Ayurveda, Shoola is regarded both as a symptom and a disease. Consequently, the discernment of a painful stimulus, ranging from negligible to severe pain, depends on the prevalence of Vayu (Vatadosha) in an individual at that time.
Pain is felt throughout the body in the Manas (brain), except in hairs, small hairs, tip of nails, ingested food, excreta, and urine.[18]
Types of Vedana/Pain
The specific nature of Vedana/pain knowledgeable by the person is deeply described in Ayurveda. Detailed descriptions are provided below. Vedana is classified into five types based on the prevalence of Dosha in relation to Vrana (wound).[18]
1. Pain of Vatik Vrana: It is experienced like pin pricking, stabbing, beating, cutting, girdling, stirring, staffing, throwing, irritating, burning, bursting, tearing or dividing type of pain in Vataj Vrana, or when there is cramp, radiating, filling type of pain, rigidity, numbness, penetrating pain, or various types of non-specific pain that occur repeatedly, it should be recognized as Vedana resulting from excessive vitiation or predominance of Vata. A similar concept is found in Sushrut Samhita.[19]
2. Pain of Paittik Vrana: It is experienced like local, regional or generalized burning sensation it appears as if smoke coming out of wound or sensation of burning charcoal covered all over the body, with rise of temperature and pain as if Kshara has been applied on the cut, wound, it shows predominance of A similar concept is found in Sushrut Samhita.[19]
3. Pain of Kaphaja Vrana: When it is experienced like itching sensation, heaviness, numbness, a sensation of being covered with paste, mild pain, rigidity, and a feeling of coldness, it is supposed to be caused by the vitiation of Sleshma or Kapha. A similar concept is found in Sushrut Samhita.[19]
4. Pain of Raktaja Vrana: The pain caused by the predominance of vitiated blood (Shonita Rakta) is similar to that caused by the vitiation of Pitta.
5. Pain in Sannipataja Vrana: When there is a mixed sense of all the types of pain described above, it should be deemed to be due to the vitiation of all three Doshas. The same description is found in Sushrut Samhita.[19]
Padmaka as Vedanasthapak[20]
Padmaka (Prunus cerasoides D. Don) Family - Rosaceae, usually called as the Himalayan cherry tree is a drug with a significant ethno-botanical and therapeutic importance.