If the inner thighs rub together when walking, it is not caused by obesity, there are several causes, such as knee joint disease, hip joint disease, muscle disease of the inner thigh muscles, all of them will appear the clinical symptoms of the inner thighs rub together when walking. A well-developed inner thigh muscle group can cause the inner thighs to rub against each other when walking, for example, when the biceps femoris, triceps femoris, and quadriceps femoris muscles are extraordinarily thick, the inner thighs will rub when walking. For patients with internal rotation of the knee and abduction of the hip, the angle of the inner thigh will become smaller when walking because of the external rotation of the knee, and then there will be mutual friction and incorrect walking posture. If walking often grinds the inner thighs, it is recommended to go to the hospital to check the pelvis, hip and knee joints.