What a missing menstrual period can mean

A missing menstrual period has many possible causes, including pregnancy, stress, illness, medication changes, and altered ovulation. It is a symptom rather than a diagnosis, and the right next step depends on your usual cycle and other changes.

Pregnancy is an early possibility whenever it could apply. Changes in sleep, emotional stress, eating, exercise, body weight, or recent illness can affect the signals that control ovulation. [Polycystic Ovary Syndrome](/conditions/polycystic-ovary-syndrome/) may cause irregular ovulation. [Perimenopause](/conditions/perimenopause/) can also alter cycle timing, particularly with hot flushes or changing bleeding patterns.

Take a home pregnancy test if pregnancy is possible, and repeat or arrange clinical testing if uncertainty remains. Write down your last period, usual cycle pattern, medicines, recent illness, stress, exercise, and weight changes. Book an appointment when missed periods recur, your cycles change substantially, or you have symptoms such as excess hair growth, milky nipple discharge, headaches, or vision changes. More detail is available in [Missed Period](/symptoms/missed-period/).

Seek urgent care for severe pelvic pain, fainting, heavy bleeding, fever, or a positive pregnancy test with pain or dizziness. These features can need prompt assessment rather than routine cycle monitoring.

Ask what causes fit your history and whether you need pregnancy, thyroid, hormone, or other tests. Tell the clinician about contraception, medicines, breastfeeding, and symptoms outside your cycle. Ask when to return if menstruation does not restart.