Abstract: A flexible planar magnetic sheet for therapeutic use has a regular repeating pattern of curved first and second areas of alternating magnetic polarity arranged so that a line traverses a plurality of said curved areas in a majority of possible orientations of the line along the surface plane of the sheet with respect to the pattern. In one embodiment, the pattern comprises an array of polka dot regions of one polarity uniformly sized and spaced on a background of opposite polarity. Alternatively, the pattern can be shaped as a series of interdigitated undulating first and second areas of alternating magnetic polarity. The areas each have curved boundaries defined by wavy lines and a width which varies between a maximum and a minimum proceeding generally lengthwise along the wavy lines of a lengthwise periodicity to define lobe-shaped portions of each area.