The invention is based upon the principle that stimulating a plurality of acupuncture points as will bring them to homeostatic balance. It follows that stimulating the whole pinna is as effective as stimulating individual acupuncture points. Therapeutic apparatus according to the invention comprises a pair of earpieces 10 joined by a band 12 to fit on a patient's head. Each earpiece 10 is provided with an inwardly directed light source 14 comprising a plurality of light emitting diodes (LEDs) powered from an electrical mains supply by way of a combined plug and transformer 16, a cable 18 and a control box 20. The control box 20 comprises a switch 22 whereby the dc power to the light sources 14 is turned on to irradiate the patient's outer ears with radiation of a selected wavelength and a rotary control 24 for adjusting the length of time it is on. The light source is pulsed at about 5 KHz.