Quick read
Key points
- 1
A period is the monthly shedding of the uterus lining, part of the menstrual cycle that typically lasts between 21 and 35 days. Bleeding usually lasts between two and seven days, and can vary in flow and symptoms from person to person and cycle to cycle.
- 2
Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
- 3
You haven't started your periods by age 16
01 · Know
What is Periods?
A period is the monthly shedding of the uterus lining, part of the menstrual cycle that typically lasts between 21 and 35 days. Bleeding usually lasts between two and seven days, and can vary in flow and symptoms from person to person and cycle to cycle.
Periods usually begin during puberty and continue until menopause, though they can be temporarily affected by factors such as stress, significant weight changes, illness, and certain medications, including some forms of contraception.
02 · Understand
Clinical context
Self-care advice
Speak to your GP if you have concerns about your periods starting, stopping, or changing significantly from your usual pattern.
03 · Act
When to see a doctor
- 1You haven't started your periods by age 16
- 2Your periods stop for three months or more and you're not pregnant
- 3You experience very heavy bleeding that requires changing protection every hour or two
- 4Periods are accompanied by severe pain that disrupts your daily life
- 5You have any bleeding between periods, after sex, or after menopause
04 · Prevent & manage
Practical steps
Take these self-care steps
These measures can help ease symptoms, support recovery, and reduce the chance of things worsening — but they don't replace medical advice if symptoms are severe or persistent.
- 1Track your cycle.Understanding your typical pattern makes it easier to notice changes that might need attention.
- 2Use the right period products for your flow.Choosing suitable pads, tampons, or a menstrual cup for your flow helps you stay comfortable and confident.
- 3Stay hydrated and eat well.A balanced diet can help support energy levels and reduce some period-related symptoms.
- 4Manage cramps with heat and gentle exercise.A hot water bottle and light movement can ease common period discomfort.
- 5Know what's normal for you.Everyone's cycle is a little different — knowing your own normal pattern helps you notice if something changes.
Evidence
References
BarnMD Health Intelligence uses authoritative and clinically relevant sources appropriate to the topic. References are shown so readers can inspect the evidence directly.
- HSE: Periods ↗
Medical information notice
Health education, not individual medical advice
BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
BarnMD Bottom Line
Periods are a normal, healthy part of the menstrual cycle, and getting to know your own pattern helps you notice when something might need checking.
Significant changes to your usual cycle, rather than the details of any single period, are usually the most useful thing to flag to a doctor.