ocr: Medical Leatuents Nausea and vomiting Nausea and vomiting are not nearly the problem they used to be, since the development of new anti-nausea drugs. Chemotherapy can cause nausea and vomiting because some drugs affect the vomiting centre in the brain. The severity depends on which drugs you're given and in what dose. Nausea can begin several hours after treatment but usually stops in a few days.
