Deep tissue massage is a type of massage aimed at the deeper tissue structures of the muscle and fascia, 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 it’s likely to be a bit more uncomfortable than a classic Swedish massage. You should always feel free to speak up if the pressure is too much for you. If the pressure is more than you can comfortably take, you might unconsciously tense up, guarding your body from pain. This makes it harder for the therapist to achieve results.
You are always better off with less pressure — only as much pressure as you can take while still being relaxed. It takes time and experience to know exactly where that point is.