Lochia is the postpartum bleeding and discharge from the uterus after giving birth. It typically lasts 4 to 8 weeks and comes in three phases - lochia rubra (bright red bleeding), lochia serosa (pinkish discharge), and lochia alba (yellowish discharge). The causes of lochia include open blood vessels in the uterus where the placenta detached and the contractions that help the uterus return to its normal size. Breastfeeding can help reduce lochia by stimulating uterine contractions. Women should use heavy pads and avoid tampons for at least 6 weeks, and see a doctor if bleeding increases or has a foul smell, which could indicate infection.