Leg pain during pregnancy is not necessarily caused by a lack of calcium, although calcium deficiency during pregnancy can cause leg pain and even lead to cramps, etc. However, leg pain during pregnancy is not necessarily caused by a lack of calcium. But leg pain is not necessarily just caused by a lack of calcium, pregnant women during pregnancy leg pain may also be the following reasons: 1, the more common is the lumbar disc herniation, with the pregnancy so that the weight of the abdomen gradually increase, the risk of lumbar disc herniation will gradually increase. Once the lumbar disc herniation is formed, it may lead to pain symptoms in the legs. 2, pregnant women with leg pain during pregnancy, it may also be due to sports injuries. Due to the sharp decline in exercise after pregnancy, so the quality of leg muscles will also rapidly decline, when the weight increase, daily walking can lead to the formation of leg muscle injury, and trigger the symptoms of leg pain.