The menstrual cycle is defined as a set of physical changes in a woman, which occur every month in order to prepare the female''s uterus for the occurrence of pregnancy and embrace of the fetus, after the release of an egg from the ovary during the ovulation process. Menstrual bleeding from the vagina, and the menstrual cycle extends from the first day of menstrual bleeding from the current period until the first day of menstrual bleeding for the next cycle, and it is worth noting that females vary in the duration of their menstrual cycle As its duration ranges between 21 and 35 days, as for menstrual bleeding, it may last from two to seven days, according to Dr. Samiha El Sebaei is a consultant obstetrician and gynecologist, infertility treatment and laparoscopic surgery. It is normal sometimes for irregularity - advance or delay - at the date of the menstrual cycle, for example this happens in the first period of the onset of menstruation in females, i.e. in puberty, and there can be other reasons behind the delay of menstruation, which may require Consult a doctor to diagnose and treat it, and what must be paid attention to is the need to record the dates of the menstrual cycle, in addition to any symptoms and health changes that accompanied it, in order to facilitate the diagnosis of the cause of the problem by the doctor.
There are a group of reasons that can be behind a late period, and among these reasons are the following:
Hormonal disorders: The cause of a delayed or absent period may be an imbalance of some hormones, such as Milk hormone (in English: Prolactin), and thyroid hormone, which can be detected through blood tests, and in fact thyroid hormone regulates metabolism in the body, in the event of an overactive thyroid gland, or hypothyroidism, the body''s hormones are from It may be affected by this, which may cause a change in the date of the menstrual cycle, and it should be noted that the milk hormone may increase due to the presence of a benign tumor in the pituitary gland inside the brain As it secretes a milk hormone, which can cause a missed period.



