title: Oestrogen, headache and oral contraceptives.
mesh_terms: D002369:Castration; D002986:Clinical Trials as Topic; D003276:Contraceptives, Oral / Q000009:adverse effects*; D004958:Estradiol / Q000009:adverse effects*; D004966:Estrogens, Conjugated (USP) / Q000009:adverse effects* / Q000627:therapeutic use; D005260:Female; D005500:Follow-Up Studies; D006261:Headache / Q000139:chemically induced* / Q000188:drug therapy / Q000453:epidemiology; D006801:Humans; D007044:Hysterectomy; D010919:Placebos
chemical_list: D003276:Contraceptives, Oral; D004966:Estrogens, Conjugated (USP); D010919:Placebos; D004958:Estradiol