Vacation means menstruation. Delayed menstruation may be caused by endocrine disorders, side effects of medication or endometritis, which need to be analyzed. 1. Endocrine disorders: The delay of menstruation in the past may be due to endocrine disorders caused by work pressure or irregular work and rest, etc. The hormone secretion in the body is different from the previous one, which leads to changes in the menstrual cycle. 2. The effect of recently taken drugs: Previously delayed menstruation now a few days earlier may be recently taken drospirenone ethinyl estradiol tablets and other drugs, caused by changes in the menstrual cycle. 3. Endometritis: The delayed menstruation now a few days earlier may also be endometritis and other diseases. Previously delayed menstruation now a few days earlier may also be other causes, it is recommended that patients once similar situations in time to improve the relevant examinations after standardized treatment, the use of drugs should be used under the guidance of a doctor, do not blindly use drugs.