Possible causes of calf valgus include: knee valgus, overweight, personal habits, etc. 1. Knee valgus: commonly known as the external eight legs, divided into physiological and pathological. Children at the age of 2 to 6 calf valgus is a normal physiological phenomenon, can improve themselves; pathologic knee valgus is relatively rare, the patient will feel joint pain, walking difficulties, the need for corrective treatment. 2. Excessive obesity: excessive obesity will appear fat deposits in the calf, so that the calf shows the valgus, such patients pay attention to diet, appropriate exercise, improve the calf valgus. 3. Personal habits: some people walk, run habitually walk outside the eight, resulting in the outer calf muscle development, the appearance of ectropion. Warm tips: long time calf ectropion patients need to go to the hospital as soon as possible to check, under the guidance of the doctor’s treatment, at the same time pay attention to walking posture.