10 Reasons your  period may be irregular and light

By Rajeshwaari Kalla | October 1, 2025 | Image: Canva

Perimenopausal hormone shifts

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The oestrogen and progesterone  fluctuate during perimenopause and menopause. This can cause lighter, irregular, or skipped periods

Ovarian function decline

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Due to primary ovarian insufficiency, ovaries slow hormone production  early. This leads to unpredictable  on light menstrual flow

Disordered eating patterns

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When your body lacks energy from food, it stops reproduction, thus causing periods to stop, lighten, or delay

Excessive physical strain

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When you overstrain, you tell your  body that it’s under stress. This often halts ovulation and makes periods irregular or barely noticeable

Thyroid hormone imbalance

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Thyroid disorders—overactive or underactive—disrupt hormonal harmony, affecting cycle timing, flow intensity,  and overall menstrual regularity

Increased prolactin levels

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Raised prolactin, even without breastfeeding, suppresses ovulation—making periods lighter, less frequent,  or totally absent for months

Uncontrolled blood glucose

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High blood sugar in unmanaged  diabetes interferes with hormonal regulation, often leading to irregular  or light menstruation

Cushing’s syndrome effects

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Excess cortisol from Cushing’s  syndrome confuses hormonal signals, deprioritising menstruation in favour  of stress-related bodily functions

Adrenal enzyme deficiency

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With congenital adrenal hyperplasia, excess androgens may suppress ovulation, leading to infrequent  or very light periods

Iatrogenic or drug-induced

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Medications, including hormonal contraceptives or psychiatric drugs,  may reduce endometrial growth,  causing lighter or irregular  menstrual bleeding patterns

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