Which of the following is a common side effect of chemotherapy for breast cancer?

Nausea is a well-documented common side effect of chemotherapy, particularly in the treatment of breast cancer. Chemotherapy works by targeting rapidly dividing cancer cells, but it also affects other rapidly dividing cells in the body, including those in the lining of the gastrointestinal tract. This disruption can lead to feelings of nausea and vomiting, making it one of the most frequently reported adverse effects among patients undergoing chemotherapy.

Managing nausea is an important aspect of cancer care, as it can significantly impact a patient's quality of life and willingness to continue treatment. Healthcare providers often prescribe anti-nausea medications, known as antiemetics, to help alleviate this side effect.

In contrast, while weight gain can occur in some patients due to factors such as hormonal changes or changes in lifestyle during treatment, it is not typically a direct side effect of chemotherapy itself. Increased energy levels are generally not expected, as many patients report fatigue and a decrease in energy during treatment. Additionally, chemotherapy is not associated with a reduced heart rate; some treatments may even cause an increase in heart rate or other cardiovascular issues.