1). Warriors when they were in battle field and hit by arrows noticed that conduction of pain to other areas of the body and immediate disappearance of pain elsewhere.
2). Researchers noticed that particular points on the body became tender or discoloured when a health there were health issues.
3). People found certain points tender when constipated and that manipulating them with pressure or pricking them brought relief.
4). Relief of pain was experienced when heat was applied. This treatment became more specific at certain areas as results were noticed.
5). Monks and sage realized/experienced that energy moving in specific areas when they would perform meditation techniques. Over centuries these energy movements were painstakingly noted, and the channel system was gradually elaborated.
From these energy flowing channels the basic theory of acupuncture treatment was formulated.
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What is acupuncture therapy: