Aunt generally refers to menstruation, menstruation delayed for 11 days, may be pregnancy, endocrine disorders, premature ovarian failure and other reasons. 1. Pregnancy: After pregnancy, the level of estrogen as well as progesterone in the pregnant woman’s body gradually rises, it will not cause retreating bleeding, which may cause the period to be delayed for 11 days. 2. Endocrine disorders: If the female patient is overly tense, anxious and stressed, it may lead to endocrine disorders and menstrual disorders, which may lead to the delay of menstruation for 11 days. 3. Premature failure of ovarian function: If female patients experience premature failure of ovarian function, the level of estrogen as well as progesterone secreted by the ovaries decreases, which may lead to the delay of menstruation for 11 days. If your period is delayed for 11 days, it is recommended that you consult a doctor in time to avoid delaying your condition.