Obstetrics referred to the U-shaped indentation of the neck, generally refers to fetal ultrasound examination suggestive of the umbilical cord around the neck, this is a common phenomenon in pregnancy, the umbilical cord around the neck usually does not cause serious consequences, and is not an indication for cesarean section, most of the time it is the mid-pregnancy due to the umbilical cord is long, the fetus in the uterine cavity to move the cause. The umbilical cord around the neck of the pregnancy should pay attention to fetal movement, good fetal heart monitoring, if necessary, and even recommended remote monitoring. During labor, we should pay attention to the change of fetal heart, due to the descent of the fetal head, the umbilical cord is pulled, sometimes there will be a transient deceleration of the fetal heart, through the position change, oxygen can be quickly improved. If it does not improve, cesarean section or forceps delivery is needed, but of course, this is very rare. In addition, it is more common for orthopedic patients to have an MRI of the cervical spine and find a U-shaped indentation in the neck. Patients usually have cervical disc herniation and osteophytes, resulting in compression of the spinal cord and dural sac in the back, and compression of multiple segments can manifest as U-shaped indentation changes. That is, there are different degrees of cervical disc herniation leading to nerve compression. The severity of the disease depends on the clinical symptoms and examination results, and the treatment plan can only be further decided according to these conditions. At the same time, we should pay attention to the maintenance of the cervical spine, avoid prolonged bowing of the head, and do more head-up exercises, such as swimming and kite flying. As the clinical return of the neck U-shaped indentation can be seen in different ways of examination, different diseases, need to be based on the specific examination situation to take targeted treatment.