Deep tissue is a type of massage aimed at the deeper tissues structures of the muscle and facsia also called connective tissue. Deep tissue massage uses many of the same movements and techniques as Swedish massage but the pressure will generally be more intense. It is also a more focused type of massage as the therapist works to release chronic muscle tension or knots (also known as adhesions). It shouldn’t hurt but likely more uncomfortable that Swedish massage. You should always speak up if the pressure is too much for you.