The heart of the hand corresponds to the location of the lungs roughly below the index, middle and ring fingers. There is a reflex zone in the heart of the hand that corresponds to the lungs, which is located on the palmar surface between the base of the 1st phalanx of the index finger on the side of the torso and the base of the 1st phalanx of the ring finger and the little finger, with the 1st phalanx being the bone closest to the palmar surface. This reflex zone can be used to treat lung disorders, and the presence of unidentified signs in this area can also be diagnostic, suggesting possible lung disease. This reflex zone can be stimulated with common massage techniques such as pointing, pressing, kneading and pushing to protect the lungs. Observe whether there are any pimples, dots, unknown lines, etc. If there are, it suggests that the lungs may be diseased and need to go to the hospital for examination.