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Garca-Marn R, de Miguel M, Fernndez-Santos JM, Carrillo-Vico A, Utrilla JC, Morillo-Bernal J, Daz-Parrado E, Rodrguez-Prieto I, Guerrero JM, Martn-Lacave I (2012) Melatonin-synthesizing enzymes and melatonin receptor in rat thyroid cells
McCallum RW, Snape W, Brody F, et al
This intensive initial treatment rapidly replenishes depleted B12 stores and addresses acute symptoms
You may have irregular periods if: The time between each period starts to change You lose more or less blood during a period than usual The number of days that your period lasts varies significantly Common Causes of Irregular Periods Irregular periods can be caused by various factors, including: Hormonal changes during puberty or menopause Using an intrauterine device (IUD) or changing birth control pills Excessive exercise Polycystic ovary syndrome (PCOS) Pregnancy or breastfeeding Stress Thyroid disorders (hyperthyroidism or hypothyroidism) Uterine abnormalities (thickening of the uterine lining, polyps, or fibroids) In rare cases, severe scarring of the uterine lining (Asherman syndrome) can also lead to irregular periods
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