Other reasons include abnormalities in the uterus, drug use including tobacco and alcohol, a deficiency of progesterone in early pregnancy (luteal phase defect) and medical diseases in the mother.
Ezinye izizathu ziquka iingxaki esibelekweni, ukusebenzisa iziyobisi kuquka ukutshaya icuba nokusela utywala, ukusilela kwe-progesterone kwiinyanga zokuqala zokukhulelwa (ingxaki yokungakhutshwa kweprogesterone eyaneleyo okanye yenwebu yesibeleko engaphenduliyo kwihomoni) kwakunye neengxaki zempilo zebhinqa elikhulelweyo.