Having periods every 2 to 3 months over several years may be due to a hormonal imbalance and is commonly seen with conditions such as polycystic ovary syndrome, thyroid disorders, stress, or changes in body weight. Even without sexual activity, these conditions can still affect the menstrual cycle and should be properly assessed. Please consult your doctor or gynaecologist, who may advise blood tests and a pelvic ultrasound to identify the cause. Treatment depends on the underlying issue and may include lifestyle changes or medication (like progestin therapy) to help regulate your menstrual cycle.