The common causes of knee pain in early pregnancy are as follows: 1. Due to changes in the hormone levels of the pregnant woman’s body in early pregnancy, the strength of the body’s muscles, ligaments and joint capsule will decrease, which will easily lead to corresponding injuries and strains when carrying out daily work and exercise, thus producing symptoms of pain. If a pregnant woman has previous underlying diseases in the knee joint, such as old damage or arthritis, the hormonal changes in the body will also lead to aggravation of symptoms and soreness. 2, mainly in early pregnancy, pregnant women will have a pregnancy reaction, and their diet will be abnormal. The amount of nutrition needed by pregnant women will increase, but the irregular diet will lead to nutritional deficiencies, such as calcium deficiency, potassium deficiency and so on, which will lead to the corresponding symptoms of knee pain. It is advisable for pregnant women to go to the hospital for a check-up to see what the problem is and to take appropriate measures to intervene.