If you’re having treatment for breast cancer, hot flashes can be more intense and last longer, particularly if menopause was medically induced. Several treatments for breast cancer can cause hot flashes: 1  ovarian shutdown or removal. 2  chemotherapy. 3  hormonal therapy: Arimidex (chemical name: anastrozole) Aromasin (chemical name: exemestane) Evista (chemical name: raloxifene) Fareston (chemical name: toremifene) Faslodex (chemical name: fulvestrant) Femara (chemical name: letrozole) tamoxifen.