Which symptom is NOT commonly associated with chemotherapy?

Enhanced cognitive ability is not commonly associated with chemotherapy. Typically, patients undergoing chemotherapy experience a variety of side effects due to the impact of the treatment on rapidly dividing cells, both cancerous and normal. Common side effects include fatigue, as the body is under stress from the treatment and may be less able to maintain energy levels. Hair loss occurs because the chemotherapy drugs can affect hair follicles, leading to thinning or complete loss of hair. Increased susceptibility to infections happens because chemotherapy can suppress the immune system by reducing the number of white blood cells, making it harder for the body to fight off infections.

In contrast, enhanced cognitive ability is not a documented or expected side effect of chemotherapy. In fact, many patients report "chemo brain," which refers to cognitive impairments such as memory issues, difficulty concentrating, and confusion that can occur as a result of the treatment. This would lead to the understanding that the symptom mentioned in this option does not align with the common experiences of patients undergoing chemotherapy.