Is it normal to have irregular periods lasting more than 4 months?

No, it is not normal to have irregular periods lasting more than 4 months. Irregular periods are defined as menstrual cycles that vary in length by more than 7 days from one cycle to the next. In general, women should have periods every 21 to 35 days. If your periods are irregular for more than 4 months, it is important to see a doctor to rule out any underlying medical conditions, such as hormonal imbalances or thyroid problems.