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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.
What are some common reasons for a late period? Missed or late periods are sometimes caused by allergy medications, antipsychotic drugs and blood pressure pills, according to Mayo Clinic. In certain cases, late or absent menstrual periods occur due to natural reasons such as breast-feeding or menopause.