Pain in the root of the thigh in the sixth month of pregnancy, the common reasons are the following: the first is due to changes in hormone levels in the body of pregnant women, such as the secretion of a large amount of progesterone, which can lead to the relaxation of tendons and ligaments, in the root of the thigh is an important joint for weight-bearing and lower limb activities, ligament relaxation will lead to local instability, which can easily lead to pain symptoms when moving; the second reason The second reason is that as the fetus gets bigger and bigger, the load on the lower limbs of pregnant women will become heavier and heavier, and the previous normal activities will cause corresponding injuries and strains, resulting in pain. Another factor is that the growing size of the uterus in the abdominal cavity will increase the abdominal pressure, which will lead to pressure on the inferior vena cava, thus affecting the blood return to the lower extremities, which will also lead to stagnation of blood and stagnation of Qi, resulting in pain at the root of the thigh.