General introduction ● Bi syndrome is characterized by obstruction of qi and blood in meridians and collaterals due to invasion of pathogenic wind,cold,damp and heat. manifested as soreness,pain,numbness and heavy sensation of the limbs, muscles,tendons,joints or bones, swollen joints and limitation of movement. General introduction Bi syndrome is characterized by obstruction of qi and blood in meridians and collaterals due to invasion of pathogenic wind, cold, damp and heat. manifested as soreness, pain, numbness and heavy sensation of the limbs, muscles, tendons, joints or bones, swollen joints and limitation of movement