A stated main idea is clearly stated but an implied main idea is left for you to interpret.
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.
1 Excessive weight loss or gain. 2  Although low body weight is a common cause of missed or irregular periods, obesity also can cause menstrual problems. 3  Eating disorders, such as anorexia or bulimia. 4  For more information, see the topic Anorexia Nervosa or Bulimia Nervosa.