Which of the following is a symptom of anemia?

Pallor is recognized as a common symptom of anemia due to the way anemia affects the oxygen-carrying capacity of the blood. When hemoglobin levels are low, there is less oxygen delivered to the skin and other tissues, which can lead to a paler appearance. This lack of oxygen can make individuals look visibly pale, especially in areas such as the face, palms, and the inner lining of the eyelids.

In terms of the other options, hypertension is typically related to a variety of cardiovascular issues rather than anemia. Job performance improvement does not relate to any symptom of anemia and can even be the opposite, as fatigue and weakness often accompany anemia. Elevated blood sugar levels are indicative of metabolic or endocrine issues, such as diabetes, not anemia. Understanding these distinctions helps clarify how pallor is specifically associated with the symptoms of anemia.