"Chemopause" is a term for the temporary induction of menopause during chemotherapy. With chemopause, periods eventually return. This may also be referred to as secondary amenorrhea. Certain chemotherapy medications are more likely to cause early menopausal symptoms. A woman who is diagnosed with cancer in her 40s may start menopause sooner than a woman in her 20s or 30s. You may experience hot flashes, mood changes, and sleep problems if you have chemopause.