Name a common side effect of chemotherapy.

Nausea and vomiting are widely recognized as common side effects of chemotherapy due to the drugs' effects on rapidly dividing cells, which include not only cancer cells but also the healthy cells in the gastrointestinal tract. Chemotherapy agents can stimulate the part of the brain responsible for nausea, leading to these symptoms shortly after treatment and sometimes even delayed reactions in the following days. Proper management strategies, such as antiemetic medications, are often implemented to help mitigate these effects for patients undergoing treatment.

In contrast, weight gain, hair growth, and increased energy levels are not typically associated with chemotherapy. Weight gain can occur due to various factors unrelated to the immediate effects of chemotherapy; hair growth can be inhibited or even temporarily lost due to the treatment; and most patients experience fatigue rather than increased energy while undergoing chemotherapy.