Deep tissue massage is a type of massage that aims at affecting the deeper tissue structure of the muscles. It also affects the connective tissue, known as fascia. Deep tissue massage helps with both small muscle injuries as well as chronic problems. Deep tissue massage is an excellent way to deal with a whiplash or sports injury, postural misalignment, treating spasms as well as muscle tension. During a deep tissue massage the therapist concentrates on releasing specific chronic muscle tension as well as the muscular knots, or adhesions.
Muscles are layered on top of each other and over lap. Some muscles are right on the surface like your rectus abdominis (six pack ab muscles), and some are much deeper in the body like your Psoas muscle (deep hip flexor). So a DTM implies that the therapist is not just working on the superficial musculature, but reaching layers of muscle and fascia (connective tissue) further below the surface.