Acupressure (a blend of "acupuncture" and "pressure") is an alternative medicine technique derived from acupuncture. In acupressure physical pressure is applied to acupuncture points by the hand, elbow, or with various devices.
Traditional Chinese medicine's (TCM) acupuncture theory predates use of the scientific method, and has received various criticisms based on scientific thinking. The anatomical or histological basis of acupuncture points or meridians, if they actually exist, is unknown. Acupuncturists tend to perceive TCM concepts in functional rather than structural terms, i.e. as being useful in guiding evaluation and care of patients.Neuroimaging research suggests that certain acupuncture points have distinct effects that are not otherwise predictable anatomically.