Swelling below the knee swollen feet may be long-term inactivity, lack of micronutrients, kidney disease, etc., you should consult a doctor in time to find out the cause of the disease. 1. Long-term non-exercise: swelling below the knee may be caused by long-term non-exercise, long-term non-exercise will lead to slow blood flow in the human body, the slow blood flow in the human body will cause the phenomenon of swollen calves, usually should pay attention to strengthen the body to exercise, speed up the human body’s blood circulation, can improve the phenomenon of swollen calves. 2. Lack of trace elements: swollen feet below the knee may be a lack of trace elements in the body caused by a reasonable planning of eating habits, pay attention to replenish the body’s need for minerals and trace elements, especially to change the bad habits of overeating, dieting and weight loss of the crowd is very prone to the phenomenon of swelling of the calves. 3. Kidney disease: swelling below the knee may be caused by kidney disease, such as nephritis and other diseases may cause swelling of the calves, the body’s water can not be completely discharged through the kidneys, easy to cause swelling of the body. There are other causes of swelling below the knee swelling feet, such as varicose veins of the lower extremities, trauma, etc., if the persistence of non-relief, it is recommended to seek medical attention in a timely manner, improve the relevant examination, to clarify the cause of the disease, and comply with the doctor’s instructions for targeted treatment, so as to avoid delays in the condition.