It can be caused by emotional strain, chemotherapy, grief or illness. There are women who sail through menopause. Contrary to what you may have heard, they do exist. Scientific evidence proves it. The effects of menopause aren't limited to the reproductive organs.
Ovaries are much more than egg production factories.
They're also glands, secreting the wildly popular hormones estrogen and progesterone. During the perimenopausal years, changing hormone levels can cause erratic, irregular periods, some much heavier than normal. But the symptoms are different for everyone. Interestingly, some studies show that passing through the transition period makes women a bit more vulnerable to stress which may be interpreted as moodiness. Finally, if you would like to know more about menopause, talk to a healthcare professional.