Common causes include:

1. Pregnancy. If this is possible please see your health care provider.
2. Recently having a baby. Periods usually start 6 – 8 weeks after giving birth, and later if you are breastfeeding.
3. Stress or illness can cause your periods to stop. Please see your health care provider.
4. Stopping oral contraceptives. It can take up to 6 months for periods to resume after stopping birth control pills.
5. Over 45 years old? May be the start of menopause.
6. Medications.
7. Hormonal problems may be signalled by weight gain, increased body and facial hair, deepening voice.