Irregular Periods: UK Online Doctor Guide
Educational information — not medical advice.
This article was prepared by the OnlineDoctor24 editorial team and reviewed for factual accuracy against UK clinical guidance (NHS and NICE). It is not written by a doctor and does not replace personal medical advice. For symptoms specific to you, book an online doctor consultation.
Key points
- Irregular periods are common, especially in teens and perimenopause.
- Causes: PCOS, thyroid, stress, weight changes, perimenopause.
- Pregnancy is always worth excluding.
- Investigation includes bloods and sometimes pelvic ultrasound.
- An online GP can assess and treat.
Causes
- Pregnancy.
- PCOS.
- Thyroid disease.
- Stress, weight loss/gain, excessive exercise.
- Perimenopause.
- Contraception (especially progesterone-only).
- Premature ovarian insufficiency.
- Hyperprolactinaemia.
Investigation
- Pregnancy test.
- Bloods: TSH, prolactin, FSH/LH/oestradiol, testosterone, SHBG, HbA1c.
- Pelvic ultrasound if appropriate.
Frequently asked questions
Common questions UK patients ask about menstrual irregularity.
How an online doctor can help
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This article is for general information only and does not replace personal medical advice from a qualified doctor. Content is reviewed against UK NHS and NICE guidance by the OnlineDoctor24 editorial team and is not authored by a medical doctor. If your symptoms worsen or you are unsure, please book a consultation with a GMC-registered GP.
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