A period that is not heavy: what to know

Menstrual flow varies between people and can change with hormonal contraception, stress, weight changes, intense exercise, illness, breastfeeding or the transition towards menopause. A light bleed can also be mistaken for spotting, especially when cycles are irregular.

A change may accompany Polycystic Ovary Syndrome, thyroid or other hormone problems, or pregnancy. Conditions linked with heavy bleeding, such as fibroids, polyps, adenomyosis or endometrial hyperplasia, do not explain every light period; symptoms and examination guide the next step.

Track the start date, number of bleeding days, flow, spotting, cramps and any missed periods for several cycles. Record contraception, medicines, stress, exercise and symptoms such as acne, excess hair growth, hot flushes, fatigue or pelvic pressure.

Take a pregnancy test if pregnancy is possible, following the test instructions. Arrange a routine review if the change persists, cycles stop, pain develops, or the pattern affects your wellbeing. A clinician may consider a pregnancy test, blood tests or an ultrasound based on your history.

Seek urgent care for severe or one-sided pelvic pain, fainting, heavy bleeding after a missed period, fever, or feeling very unwell. Contact a clinician promptly for bleeding after menopause, bleeding between periods that keeps returning, or symptoms of anaemia such as unusual breathlessness, paleness or marked tiredness.

Ask: Is this change expected for my age or contraception? Could pregnancy or a hormone condition explain it? Do my symptoms suggest perimenopause, fibroids or another pelvic problem? Do I need tests? What bleeding changes should make me call sooner?