After an artificial hip replacement, many patients experience swelling of the lower extremities for a long period of time. The reason for the swelling is that in the process of hip replacement, the surgeon has to loosen the tissues and muscles around the hip joint to make the muscles relax for the surgery, which inevitably hurts some small blood vessels that are not very important. When the blood vessels are affected, the blood circulation becomes poor and the venous return is not good, which will lead to swelling of the lower limbs. In particular, the hip joint is in a more important position, and the blood flow to the lower extremities has to pass through the hip joint, so the lower extremities are more likely to be swollen after surgery. Usually, patients will have obvious swelling of the lower extremities during the afternoon and evening hours after rehabilitation, and the swelling of the extremities will disappear after a night of lying down and resting. After six weeks or three months after surgery, if the swelling of the lower extremity still occurs, especially compared with the other leg, the swelling of the affected leg is more obvious, it is recommended that the patient go to the hospital for a venous ultrasound of both lower extremities to rule out the possibility of lower extremity venous thrombosis. It is important to know that the typical symptom of lower extremity venous thrombosis is swelling of the limbs, and if left untreated at this time, it may lead to pulmonary embolism due to dislodgment of the thrombus. Therefore, at this time, if there is venous thrombosis in the lower extremity, this is the time to treat the thrombosis. If the ultrasound is done and it is determined that it is not lower extremity vein thrombosis, in order to eliminate the swelling, the patient can use some drugs that have a decongesting effect on the blood vessels, such as mai zhi ling and indomethacin suppositories. At the same time, the intensity of rehabilitation training such as walking should be moderately reduced, and the affected limb should be elevated to promote blood circulation and smooth venous return.