title: Headache immediately following attempted epidural analgesia in obstetrics.
mesh_terms: D000767:Anesthesia, Epidural / Q000009:adverse effects*; D000773:Anesthesia, Obstetrical / Q000009:adverse effects*; D005260:Female; D006261:Headache / Q000209:etiology*; D006801:Humans; D007744:Obstetric Labor Complications / Q000209:etiology*; D011247:Pregnancy