Breakthrough bleeding number one problem with OC use.
D000554:Ambulatory Care Facilities; D000569:Americas; D001695:Biology; D003267:Contraception; D003276:Contraceptives, Oral; D003376:Counseling; D019049:Developed Countries; D004194:Disease; D004703:Endocrine System; D004967:Estrogens; D005193:Family Planning Services; D006285:Health Planning; D006470:Hemorrhage; D006728:Hormones; D009656:North America; D009934:Organization and Administration; D010827:Physiology; D012816:Signs and Symptoms; D013812:Therapeutics; D014481:United States
D003276:Contraceptives, Oral; D004967:Estrogens; D006728:Hormones
Americas; Biology; Bleeding; Clinic Activities; Contraception; Contraceptive Methods--side effects; Counseling; Developed Countries; Diseases; Endocrine System; Estrogens; Family Planning; Hormones; North America; Northern America; Oral Contraceptives--side effects; Organization And Administration; Physiology; Program Activities; Programs; Signs And Symptoms; Treatment; United States