Knee pain during pregnancy is commonly caused by increased weight-bearing, calcium deficiency, cold knees or other factors. 1. Increased weight-bearing: With the growth and development of the fetus in the body during pregnancy, the weight of pregnant women gradually increases, resulting in overloading of the knee joints and symptoms of pain. In this case, pregnant women need to rest more, reduce the activities of up and down steps, can be assisted in the pain with massage, massage and other techniques. 2. Calcium deficiency of pregnant women: pregnant women in the middle and late stages of pregnancy due to the rapid growth and development of the fetus, need a lot of nutrients from the mother, which can cause maternal nutritional deficiencies, at this time, should be appropriate to supplement some of the high calcium content of food such as eggs, tofu and so on. 3. Knee cold: knee pain can occur when the knee joints get cold inadvertently, in this case you need to pay attention to keep warm, and you can relieve the pain by applying warm water bags locally. In addition, other factors may also lead to the emergence of the situation, such as arthritis, trauma, etc. Therefore, it is recommended that pregnant women with knee pain, such as rest can not be relieved, it is recommended to go to the hospital in a timely manner to check, clarify the cause of the disease, and then comply with the doctor’s instructions for treatment.