If the period suddenly does not come for two days, it may be caused by the following reasons: the first, drinking too many frozen drinks, so that the period suddenly does not come, you can drink a bowl of hot brown sugar water every day to observe whether the period will come again. Secondly, a sudden shock may also cause the absence of menstruation. Thirdly, this condition is caused by pregnancy and a small amount of bleeding when it comes to menstruation. It is always recommended to take a blood test for HCG to rule out the possibility of pregnancy. Fourthly, this condition is also seen when the body is suddenly hit by a rainstorm and suffers from cold stimulation, which can also make the menstruation not come. Anyway, we should take the clinical history to find out the cause and then give the next step of treatment.