Irregular menstruation in a 19-year-old girl is a disease. Generally 19-year-old girls at this time the gonads and ovaries are well developed, so irregular menstruation may be a disease. If the girl is younger, between 13 and 15 years old, the irregular menstruation at this time may be a normal physiological reaction, mainly related to the incomplete development of the body. The 19-year-old girl appeared irregular menstruation, it is recommended to actively seek medical examination and treatment, generally can be used under the guidance of the doctor wuji baifeng pills, motherwort granules and other medications, usually need to maintain a good state of mind, to avoid mental stress. The 19-year-old girl usually need to pay attention to personal hygiene, relaxation, to avoid disease.