Effectiveness of Back Care Pillow in Addition to Physical Therapy in Chronic Non-specific Low Back Pain Treatment

Inclusion Criteria: * Males or females * Age 20 - 69 years old. * Patients who have daily routine in so long bending of sitting or standing position at least 2 hours per day * Patients with low back pain who have pain for more than 3 months * Patients have pain at lower back without refer to leg * Patients have moderate to severe pain of numerical rating scale (pain score ≥ 4) Exclusion Criteria: * Pregnant patients * Underlying systematic or visceral disease, and specific condition such as neoplasm, ankylosing spondylitis, previous low back surgery * Patients have Quada equine syndrome * Patients with nerve root symptoms (neurological deficit) 1. Patient have refer pain to leg area of same dermatome is problem. 2. Abnormal reflex of lower extremity. 3. Muscle weakness of area myotome is problem.