Swelling of woman’s legs may be caused by varicose veins, hypothyroidism, heart failure and other reasons, the specific causes need to go to the hospital to determine the examination. 1. Varicose veins: varicose veins are generally caused by long-term standing, heavy physical labor, etc. If varicose veins of the lower extremities occur, the patient’s early skin of the lower extremities will appear greenish-purple vein protrusions, with the development of the disease, the patient’s lower extremities will appear edema, heavy, soreness and discomfort. It is necessary to do ultrasound examination of the veins of lower limbs to make a clear diagnosis and check whether there is venous thrombosis, venous valve function reflux and other diseases. 2. Hypothyroidism: Hypothyroidism is usually caused by drug factors, thyroid destruction, etc. The disease develops slowly, and there are usually no obvious symptoms in the early stage. With the development of the disease, the patients will have different degrees of swelling of the hands and feet, joint pain, menstrual disorders, fear of cold, malaise and other symptoms. 3. Heart failure: heart failure is caused by infection, arrhythmia, coronary artery disease, rheumatic heart disease, etc. Early symptoms of patients are generally not obvious, with the development of the disease, the patient’s legs will appear edema, but also upward and gradually spread to the whole body, the patient will also appear dyspnea, chilled limbs, abdominal distension, vomiting and other symptoms. If a woman develops leg swelling, along with other symptoms, she should go to the hospital in time for medical treatment and follow the doctor’s instructions after diagnosis.