A period is also known as menstruation, and the absence of menstruation for 55 days is considered abnormal and needs to be handled in cooperation with your doctor. For women, the normal menstrual cycle is around 21~35 days, so whether it is delayed or advanced by a week, it is a normal phenomenon. If menstruation is delayed for more than 7 days, it is an abnormal phenomenon, and you need to cooperate with your doctor to improve the examination and clarify the cause before treatment. For women of childbearing age, if they have unprotected sex and experience delayed menstruation, the possibility of pregnancy should be highly suspected and can be clarified through blood and urine tests. Of course, menstruation can also be affected by the environment, factors, emotions and diseases. Women with endocrine disorders such as polycystic ovary syndrome, hyperprolactinemia, hyperthyroidism, etc. may also experience delayed menstruation and not have a period for 55 days. When a woman experiences delayed menstruation, she should identify the cause as soon as possible and work with her doctor to regulate it.