A device (10) is presented for use in treatment of tissues inside a body cavity. The device comprises a probe member (12) having at least a portion thereof carrying a plurality of light sources (18), at least said portion of the probe member (10) having dimensions and shape suitable for insertion into a certain body cavity and for arranging within the surface thereof a three-dimensional array of said light sources, the light sources being configured and operable to irradiate optical energy outwardly from said probe member.