Often Deep Tissue massage therapy will cause some tenderness when your massage therapist is working hard to work out the tension, scar tissue and trigger points from your muscles and ligaments. And yes sometimes you will feel a little stiffness the day after. But most often this soreness is a welcome relief as your therapist has the skill to pinpoint the source of your pain and work it out. This being what it is its necessary for you to communicate clearly with your therapist if he/she is using more pressure or creating more pain than you are comfortable with.