. Its main functions are to invigorate the blood, promote menstruation, and reduce pain and swelling. Sappan wood is often used to treat blood-related conditions such as dysmenorrheal and amenorrhea, and to reduce abdominal pain following childbirth. Sappan wood is also used to reduce pain and swelling caused by external injuries. In addition, sappan wood yields a natural dye (derived from the chemical brazilian), which is used to color fabrics and handicrafts.