Nausea and vomiting Chemotherapy is notorious for making people feel nauseous and causing vomiting, but hormonal treatments and targeted therapies can do the same. If you lose your appetite you might find that eating very small meals helps with nausea and eating dry foods is less likely to upset your stomach. If cooking smells make you nauseous, get someone else to cook for you or eat take-out. If you're vomiting, speak to your doctor about anti-nausea medication. New tool for ER-positive breast cancer may predict who needs chemotherapy.