Sore legs after childbirth may be caused by not paying attention to warmth during the monthly period, lack of calcium, postpartum rheumatism and other reasons. 1. Not paying attention to warmth: women’s bodies will become weak after childbirth, if they don’t pay attention to warmth during menstruation, resulting in cold legs, the symptoms of postnatal leg pain when cold may occur. 2. Calcium deficiency: If a woman is deficient in calcium during pregnancy and breastfeeding, and does not take calcium supplements in time, the lack of calcium may lead to post-partum sore legs. 3. Postpartum rheumatism: due to post-partum exposure to cold or excessive psychological stress after childbirth, it is easy to induce post-partum rheumatism, also commonly known as menstrual disease, which will cause post-partum rheumatism such as soreness of the legs when cold. It is recommended to go to the hospital in time to take targeted treatment measures under the guidance of a professional doctor for postpartum sore legs.