Premenstrual syndrome (PMS) and menopause are conditions that affect women. PMS involves cyclic symptoms like mood changes that occur in the week before a woman's period. It is caused by changes in estrogen and progesterone levels. Treatment may include lifestyle changes, antidepressants, or hormonal birth control. Menopause is when periods stop permanently due to low estrogen levels. It causes symptoms like hot flashes and vaginal dryness. Hormone replacement therapy can relieve symptoms but also has risks, so non-hormonal options are also used.