Scar tissue is a term used to describe tissue that forms when the body repairs damaged tissue. Synonyms for scar tissue include fibrous tissue, adhesions, tough tissue, and cicatrix. These terms describe the same thing, but with a different emphasis on the physical characteristics of the tissue. Fibrous tissue speaks to the strong and resilient nature of scar tissue, while adhesions refer to the way it can attach to other tissues. Tough tissue connotes the durability of scar tissue, and cicatrix describes the process of tissue repair and scarring. Regardless of the synonym used, scar tissue can be painful, restricting movement and function.