Menstruation is a natural, healthy sign that your reproductive system is functioning correctly. However, because every body is different, it can be difficult to know what “normal” actually looks like.
Whether you are navigating menarche (your first period) or approaching menopause, this guide explains the biology, timelines, and care essentials of the menstrual cycle.
A period is the monthly shedding of the uterine lining (endometrium). This process is governed by a delicate balance of hormones, primarily estrogen and progesterone.
Menstrual Timeline
Cycle Length: The time from the first day of one period to the first day of the next. While 28 days is the textbook average, a healthy cycle can range anywhere from 23 to 35 days.
Period Duration: Most periods last between 2 and 7 days.
The Flow: It is normal for the first two days to be the heaviest, with the flow tapering off and becoming darker (brownish) toward the end.
It often feels like you are losing a significant amount of blood, but the actual volume is usually quite small.
The Average: Most women lose between 20ml and 90ml (roughly 1 to 5 tablespoons) of fluid over the course of their entire period.
Variation: “Normal” is subjective. If you find yourself soaking through a heavy-duty pad or tampon every hour, or passing clots larger than a 10p coin, you should consult a GP to rule out conditions like menorrhagia (heavy menstrual bleeding).
Menarche is the medical term for a girl’s first period.
Typical Age: Most girls start their periods around age 12, though starting anywhere between 10 and 15 is considered normal.
Irregularity: It is very common for cycles to be unpredictable for the first few years. It usually takes until age 16 to 18 for the body to establish a consistent, regular rhythm.
Delayed Onset: If a girl hasn’t started her period by age 15 or 16, or three years after breast development began, a quick check-up with a doctor is recommended.
There are more options today than ever before, allowing you to choose based on comfort, activity level, and environmental impact.
| Product | Method | Best For |
| Sanitary Pads | External absorbent strips | Beginners or those with sensitive skin. |
| Tampons | Internal cotton “plugs” | Swimming, sports, and discreet wear. |
| Period Underwear | Reusable absorbent fabric | Eco-conscious users and overnight protection. |
| Menstrual Cups | Silicone internal collection | Long-wear (up to 12 hours) and zero waste. |
A common fear for new users is that a tampon might get “lost.” Physically, this is impossible. The cervix (the opening to the womb) is far too small for a tampon to pass through.
Toxic Shock Syndrome (TSS): This is an extremely rare but serious bacterial infection. To minimize risk, always use the lowest absorbency necessary for your flow and change your tampon every 4 to 8 hours.
Forgotten Tampons: If you forget to remove a tampon, it can cause a strong odor or discharge. If you cannot remove it yourself, a nurse or GP can help you easily and without judgment.
Menopause is officially diagnosed when you have gone 12 consecutive months without a period.
Average Age: In the UK, the average age for menopause is 51.
Perimenopause: This is the transitional phase leading up to menopause. During this time, periods may become closer together, further apart, heavier, or lighter.
Symptoms: You may also experience “hormonal” symptoms like hot flushes, mood changes, or night sweats as estrogen levels decline.
While some discomfort (cramping) is normal, your period shouldn’t stop you from living your life. Contact your GP if you experience:
Amenorrhoea: Your periods stop completely for more than 3 months.
Intermenstrual Bleeding: Bleeding between your periods or after sex.
Severe Pain: Cramping that isn’t relieved by over-the-counter painkillers.
Postmenopausal Bleeding: Any bleeding that occurs after you have gone through menopause.
Every menstrual cycle is a unique data point about your overall health. By tracking your dates and flow, you can learn what is normal for your body and identify when something feels off.
Are you currently tracking your cycle on an app, or are you noticing any new changes in your rhythm lately?
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