Irregular periods

Irregular periods, also known as oligomenorrhea or menstrual irregularity, refer to changes in the normal menstrual cycle pattern. A normal cycle is usually between 21 to 35 days and lasts around 3–7 days. Periods are considered irregular if they:

• Occur less than every 21 days or more than every 35 days

• Vary significantly in length month to month

• Are unusually heavy (menorrhagia) or very light (hypomenorrhea)

• Are absent for 3 months or longer (amenorrhea, excluding pregnancy and menopause)

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Causes

Irregular periods can have various underlying reasons:

• Hormonal imbalances

  • Polycystic ovary syndrome (PCOS)

  • Thyroid disorders (hypothyroidism or hyperthyroidism)

  • Perimenopause or menopause

  • High prolactin levels (hyperprolactinemia)

• Reproductive health conditions

  • Endometriosis

  • Uterine fibroids

  • Pelvic inflammatory disease (PID)

• Lifestyle and external factors

  • Stress and anxiety

  • Significant weight loss or gain

  • Excessive exercise

  • Poor nutrition or eating disorders

• Other medical causes

  • Diabetes

  • Certain cancers (rare, e.g., ovarian, uterine)

  • Medications (hormonal contraceptives, antipsychotics, chemotherapy drugs, anticoagulants)

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Symptoms to Watch For

• Unpredictable cycle timing

• Missed periods

• Heavy bleeding with clots

• Severe cramps or pelvic pain

• Spotting between cycles

• Associated symptoms like acne, hirsutism, or weight gain (common in PCOS)

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Diagnosis

A healthcare professional may perform:

• Medical history and physical exam

• Pelvic exam and Pap smear

• Blood tests (hormones: FSH, LH, TSH, prolactin, androgens)

• Ultrasound (to check ovaries and uterus)

• Endometrial biopsy (if endometrial disease is suspected)

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Treatment

Management depends on the underlying cause:

• Hormonal therapies

  • Combined oral contraceptives (ethinylestradiol + levonorgestrel, drospirenone, etc.) to regulate cycles

  • Progesterone (medroxyprogesterone acetate, norethisterone) to induce withdrawal bleeding

  • Levonorgestrel intrauterine system (LNG-IUS) for heavy or irregular bleeding

• PCOS-related

  • Metformin to improve insulin sensitivity

  • Anti-androgens (spironolactone) for symptoms like hirsutism

• Thyroid disorders

  • Levothyroxine for hypothyroidism

  • Antithyroid drugs (carbimazole, methimazole, propylthiouracil) for hyperthyroidism

• Lifestyle interventions

  • Stress reduction (yoga, CBT, relaxation techniques)

  • Weight management and balanced nutrition

  • Avoiding excessive exercise or restrictive diets

• Other treatments

  • Non-steroidal anti-inflammatory drugs (NSAIDs) like ibuprofen for pain and heavy bleeding

  • Surgical options for structural causes (fibroid removal, endometrial ablation, hysterectomy in severe cases)

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Precautions

• Keep a menstrual diary or use a tracking app to monitor cycles

• Seek medical advice if periods suddenly change pattern

• Avoid self-medicating with hormonal pills without supervision

• Women over 40 with irregular bleeding should undergo careful evaluation to exclude endometrial cancer

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Drug Interactions

• Oral contraceptives may interact with:

  • Certain antibiotics (rifampicin, rifabutin – reduce effectiveness)

  • Anticonvulsants (phenytoin, carbamazepine, topiramate, barbiturates)

  • St. John’s Wort (herbal antidepressant)

• NSAIDs may interact with:

  • Anticoagulants (warfarin, DOACs – increased bleeding risk)

  • Corticosteroids (increased GI irritation)

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When to See a Doctor

• Periods absent for more than 3 months without pregnancy

• Very heavy bleeding soaking through pads/tampons every hour

• Severe pain interfering with daily activities

• Symptoms of anemia (fatigue, dizziness, pallor)

• Sudden irregularity after years of stable cycles