Health care device and health care method

A health care method, comprising:

• arranging a health care device at a predetermined location in front of a belly button of a user with a predetermined distance;
• and
• using the health care device to emit a low-frequency wave with a predetermined frequency to the belly button;
• wherein the health care device comprises:
• a cone/pyramid part, having a vertex, a bottom surface and a body, wherein two ends of the body of the cone/pyramid part are respectively connected to the vertex and the bottom surface of the cone/pyramid part;
• and
• a low-frequency wave emitter, connected to the bottom surface of the cone/pyramid part, configured to emit the low-frequency wave with the predetermined frequency;
• wherein the predetermined frequency is between 1.27 Hz and 1.81 Hz;
• wherein the low-frequency wave emitter is an infrasonic transducer, and the low-frequency wave is an infrasonic wave;
• wherein the predetermined location is located on a virtual bottom surface of a virtual cone above the belly button, the predetermined distance is 5 cm to 8 cm;
• the predetermined location is a circular center of the virtual bottom surface, the predetermined distance is a distance from the circular center of the virtual bottom surface to the belly button, and the vertex of the health care device is located on the predetermined location.