Not many people understand that the aim of an arjan meditate in jungle is actually to gain more herbal knowledge from jungle spirits. For example, the spirits would inform the arjan on where to find certain herbs or minerals to cure certain illnesses.
It would be another long discussion on the theory of Thai medicine, herbs, physical treatments and incantations. Perhaps it is suffice to say that Thai medicine follows Indian Ayurveda very closely though some Chinese influence may be present.
Just take an example, in Thai medicine bleeding is cured by using herbs and physical methods and in addition to the above; incantation or khata is also recited. An example of a khata to stop bleeding:
Another khata to reduce pain: