The missed menstrual period.
The most likely cause of a missed menstrual period in a woman of childbearing age is pregnancy, stress, or the effects of the pill. If fear of pregnancy is the basis of the problem, simply reassuring the patient that menstrual extraction is available may bring spontaneous resolution.
D000028:Abortion, Induced; D000568:Amenorrhea / Q000209:etiology; D000858:Anovulation / Q000150:complications; D003278:Contraceptives, Oral, Hormonal; D005260:Female; D006801:Humans; D008598:Menstruation; D008599:Menstruation Disturbances / Q000175:diagnosis* / Q000209:etiology; D008600:Menstruation-Inducing Agents / Q000627:therapeutic use; D011247:Pregnancy; D011259:Pregnancy Tests, Immunologic; D013315:Stress, Psychological
D003278:Contraceptives, Oral, Hormonal; D008600:Menstruation-Inducing Agents