Back Pain, Herniated Disc, Massage Therapy, Physical Therapy, Shockwave Therapy, Spinal DecompressionMark MonsonDecember 17, 2024low back dermatomes, dermatomal pain, L4 nerve distribution, L4 nerve root distribution, nerve root distribution, lumbar dermatomes, lumbar nerve pain, low back pain causes, dermatome map, nerve root issues, sciatica pain, lumbar nerve treatment, spinal nerve distribution, nerve compression, lower back pain relief