Although pregnancy is one of the most known causes for a delay in menstruation, there are other possible reasons. Among them, we can mention the following:
- Elite sports.
- Thyroid alterations.
- Rapid weight changes.
- Some medications.
In addition, irregular cycles are also possible during the first year after the first menstruation. Thus, menstrual delays are relatively common in adolescents, until the menstrual cycle becomes more regular