Lochia is the vaginal discharge consisting of blood, mucus, and uterine tissue following childbirth. It typically persists for 2-4 weeks as the uterus involutes and the endometrial lining regenerates. This timeframe reflects the normal postpartum healing process. Lochia progresses through stages—lochia rubra, serosa, and alba—before ceasing. Persistence beyond 4 weeks may indicate abnormal healing or infection. Understanding the typical duration helps differentiate normal postpartum recovery from potential complications.

Reference: Williams Obstetrics, Cunningham et al., 26th Edition.