About this symptom
Abnormal uterine bleeding in teenagers refers to menstrual bleeding that is unusually heavy, prolonged or irregular or affects everyday wellbeing. Cycles may take time to become regular after the first period, but major blood loss must not be dismissed as normal for age.
What to know
Cycles without ovulation are common in the years after menarche, yet a clinician also considers iron deficiency, anaemia, bleeding disorders, endocrine causes and other possibilities. Pregnancy-related causes are assessed sensitively when relevant, respecting the adolescent’s privacy.
Symptoms and reasons for assessment
Warning signs of heavy loss include very frequent changes of sanitary products, prolonged bleeding, large clots, overnight leakage, fatigue, dizziness or breathlessness. A period diary can help describe duration, flow and effects on school and daily life.
Other possible causes
Some variation in cycle length is expected during adolescence, but severe blood loss, persistent irregularity or symptoms of anaemia cannot be explained away without assessment. Underlying clotting problems may need attention, especially when there is easy bruising or frequent nosebleeds.
How clinicians assess the problem
The clinician evaluates circulation and bleeding severity, menstrual and personal history, medicines and relevant symptoms. A blood count, ferritin and selected coagulation or endocrine tests may be appropriate. Pelvic ultrasound is not routinely required as a first investigation for everyone.
Treatment and follow-up options
Management depends on blood loss, haemoglobin, cause and contraindications. It can involve observation, prescribed iron replacement or clinician-selected treatment to control bleeding. Hormonal or haemostatic medicines must not be started without individual medical advice.
When urgent care is necessary
Very heavy ongoing bleeding, fainting, pronounced weakness, dizziness on standing, breathlessness, rapid heartbeat or severe pain requires urgent assessment. Do not wait for a scheduled visit if substantial blood loss is suspected; call 103 for emergency help.
Related health information
Signs and symptoms
Diagnosis and tests
Care and treatment approaches
When to seek urgent care
Frequently asked questions
Are irregular periods always normal after the first period?
Cycles may be irregular initially, but very heavy, prolonged or debilitating bleeding should be medically assessed.
Why are iron and haemoglobin checked in teenagers with heavy periods?
Repeated or prolonged blood loss can cause iron deficiency and anaemia, so a blood count and ferritin may be recommended.
Does every teenager with abnormal bleeding need ultrasound?
No. Assessment and relevant blood tests are often the first steps; ultrasound is chosen for particular clinical indications.
Important information
A medical consultation is needed for diagnosis and treatment recommendations.
Self-treatment can be harmful to your health.
