The causes of irregular periods can be summarized as follows:
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Hormonal imbalances (e.g., PCOS, thyroid disorders, perimenopause, menopause)
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Stress
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Weight fluctuations (extreme weight loss or obesity)
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Polycystic ovary syndrome (PCOS)
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Thyroid disorders (hypothyroidism or hyperthyroidism)
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Uterine abnormalities (polyps, fibroids, endometriosis)
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Medications and contraceptives
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Breastfeeding and pregnancy
Remember, it's important to consult a healthcare professional for a proper diagnosis and treatment if you experience persistent or significant changes in your menstrual cycle.