发生于头先露的难产为头位难产,即凡因难产以手术(剖宫产、阴道助产)结束分娩者为头位难产,阴道助产除包括产钳术及胎头吸引术外,亦应包括徒手旋转胎头,这样胎头位置异常如持续性枕后位(简称持后位)及持续性枕横位(简称持横位)经徒手旋转胎头自然分娩者也应算为头位难产;个别的头位分娩由于 The first dystocia occurs in the first dystocia for dystocia, that where the dystocia due to surgery (cesarean section, vaginal midwifery) end of delivery as the first dystocia, vaginal midwifery in addition to including forceps and fetal head suction surgery, but also Should include the rotation of the fetal head by hand, so abnormal fetal head position such as persistent posterior position (hereinafter referred to as posterior position) and continuous occipital transverse position (transverse position) by hand rotation of the fetal head spontaneous delivery should also be counted as head position Difficult labor; individual head due to childbirth