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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.
The most common causes of hormone imbalance: 1  Stress and a hectic lifestyle can release stress hormones, which can disrupt your usual cycle and cause a late period. 2  Diet and unhealthy eating can impact your body and your flow. Similarly, weight loss or gain can make changes to your period.