Introduction
Menstruation is a normal physiological process, but its pattern may be influenced by age, reproductive stage, psychological stress, weight changes, medicines, and medical conditions. A cycle that differs from the common pattern does not necessarily indicate disease. However, persistent changes or symptoms that interfere with daily life should be medically assessed.
What menstrual pattern may be considered normal?
Cycle length is counted from the first day of bleeding to the first day of the next period. Duration and flow vary between individuals. During the first years after menarche, periods may be relatively irregular because ovulation is not yet consistently established. Nevertheless, an interval of more than 90 days between periods should be evaluated, including in adolescents. [1]
A single numerical estimate of blood loss is not usually practical. More useful indicators include needing to change a pad or tampon every one to two hours, bleeding for more than seven days, or repeated leakage that interferes with normal activities. [1]
What is a menstrual disorder?
A menstrual disorder may involve one or more of the following:
Clearly irregular periods.
Infrequent periods or prolonged absence of menstruation.
Periods occurring unusually close together.
Heavy or prolonged bleeding.
Bleeding between periods or after sexual intercourse.
Severe or progressively worsening period pain.
Premenstrual symptoms that significantly affect work, education, or social relationships.
The World Health Organization notes that unpredictable or infrequent bleeding, severe pain, heavy bleeding, or symptoms that disrupt usual activities may indicate an underlying condition such as endometriosis, adenomyosis, fibroids, bleeding disorders, polycystic ovary syndrome, or primary ovarian insufficiency. [2]
Possible causes
There may be more than one contributing cause, including:
Ovulatory dysfunction, including polycystic ovary syndrome.
Thyroid disease or elevated prolactin levels.
Pregnancy and pregnancy-related complications when pregnancy is possible.
Major weight changes, inadequate nutrition, or strenuous exercise.
Psychological stress and sleep disruption.
Fibroids, polyps, or adenomyosis.
Endometriosis, particularly when pain is severe or persistent.
Bleeding disorders, especially when heavy bleeding began with the first periods or is accompanied by easy bruising or recurrent nosebleeds.
Some medicines or contraceptive methods.
Less common causes, such as primary ovarian insufficiency or endometrial disease.
When should you see a doctor?
Arrange a medical appointment if you experience any of the following:
Persistent or recurrent irregular periods after previously regular cycles.
No period for three months or longer when pregnancy is not known or expected.
Bleeding lasting more than seven days or repeatedly becoming very heavy.
Needing to change menstrual protection every one to two hours.
Bleeding between periods or after intercourse.
Severe pain that does not improve or prevents usual activities.
Possible symptoms of anaemia, such as persistent fatigue, dizziness, shortness of breath, or palpitations.
Menstrual changes accompanied by increased facial or body hair, severe acne, or marked weight changes.
Very heavy bleeding accompanied by severe dizziness, fainting, marked weakness, or severe pain requires urgent assessment. If pregnancy is possible, bleeding or pain should be assessed promptly to exclude pregnancy-related causes.
How is the condition assessed?
Assessment usually begins with questions about the menstrual pattern, duration and approximate amount of bleeding, pain, medicines, associated symptoms, and the possibility of pregnancy. Tests may include:
A complete blood count to assess for anaemia when bleeding is heavy; NICE recommends this for all women with heavy menstrual bleeding. [3]
A pregnancy test when pregnancy is possible.
Targeted tests, such as thyroid testing when symptoms suggest thyroid disease, or testing for a bleeding disorder when clinical findings indicate this.
Pelvic ultrasound or other investigations based on symptoms and examination findings.
Not every person needs every test. The choice depends on age, symptoms, medical history, examination findings, and the patient’s priorities.
Is the treatment the same for everyone?
No. Treatment depends on the cause, symptom severity, anaemia, age, pregnancy plans, coexisting conditions, and the patient’s preferences. Options may include treatment for anaemia, non-hormonal medicines to reduce bleeding or pain, hormonal treatments, or treatment directed at conditions such as fibroids or endometriosis. NICE states that a levonorgestrel-releasing intrauterine system may be a first treatment option for some women with heavy menstrual bleeding when specific structural abnormalities are absent; alternatives are available when it is unsuitable or not preferred. [3]
Hormonal tablets or medicines intended to reduce bleeding should not be started without checking that they are appropriate, particularly when pregnancy is possible or there is a history of thrombosis, migraine with visual symptoms, chronic disease, or other medicines.
What should you record before an appointment?
Keeping a record for several months may be helpful. Note:
The first and last day of each period.
The number of bleeding days and approximate flow.
The number of pads or tampons used and any leakage.
Pain and associated symptoms.
Medicines and contraceptive methods.
Changes in weight, stress, sleep, or physical activity.
Conclusion
Not every irregular period indicates disease, particularly during the first years after menarche or after a temporary change in weight or stress. However, heavy bleeding, prolonged absence of periods, severe pain, bleeding between periods, or symptoms that affect daily life should not simply be accepted as normal. Early assessment can identify anaemia and hormonal or structural causes and support an appropriate treatment plan.
This is general educational information and does not replace individual medical assessment. The article should be reviewed and edited by a qualified medical professional before publication.