Device (1) for assessing, preventing and treating LBP, which comprises: six units (100a, 100b, 100c, 100d, 100e, 100f), each unit comprising: an EMG acquisition subsystem (30a); connecting means (10a-20a, 10b-20b, 10c-20c, 10d-20d, 10e-20e, 10f-200 for connecting the EMG acquisition subsystem (30a) to a pair of electrodes attached to a patient's skin, such that each unit receives the surface EMG signals of a specific muscle group of the patient; and, a actuator (60a) for providing haptic stimulus to said muscle group; a muscular activity pattern recognition and feedback subsystem (200, 500); the device further comprising: a wearable garment (300, 301, 302) with a central portion (300e) to which the second and fifth units (100b, 100e) are attached parallel to each other; and a set of four straps (300a, 300b, 300c, 300d) to which ends are attached the first, third, fourth and sixth units (100a, 100c, 100d, 100f) at 45°, 135°, −135° and −45°, respectively, with respect to the second and fifth units (100b, 100e).