The invention relates to a foot device for treating vascular complaints in the lower limbs, which comprises an L-shaped support structure (2) with a soft inner covering (3) into which radio-frequency electrode plates (4, 4') are integrated, as an adjustable base for contact between the lower part of the leg and foot of the patient and the electrode plates (4, 4'), the structure (2) having securing means (6) for autonomously keeping the structure attached to the limb and keeping the electrode plates (4, 4') in contact with the patient's skin. The support structure (2) is rigid and comprises a vertical branch (2a) sized to accommodate and act as a support to the area of the rear end part of the patient's leg, and a horizontal branch (2b) sized to accommodate the sole of the patient's foot.