Worried about a late period, but know you’re not pregnant? Missed or late periods happen for many reasons other than pregnancy. Common causes can range from hormonal imbalances to serious medical conditions.
4. Polycystic ovary syndrome (PCOS)
When to see your doctor
Your doctor can properly diagnose the reason for your late or missed period and discuss your treatment options. Keep a record of changes in your cycle as well as other health changes to show your doctor. This will help them make a diagnosis.
read the full article here: https://www.healthline.com/health/womens-health/why-is-my-period-late#thyroid-issues