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The hypothalamus is very affected by stress.. So if youâre dealing with a big move, death in the family, huge breakup, or any other life event that's shaking you up, it could be the cause of your late period or missed period. A Thyroid Irregularity. The thyroid gland, located in your neck, regulates your metabolism.
Doctors aren't clear on why the thyroid causes problems with the menstrual cycle. Sometimes women with thyroid disorders don't ovulate or if they do they may have a weaker ovulation and shorter luteal phase. Anything that interferes with normal ovulation can cause your period to be late or to become irregular.