What is a direct consequence of a low white blood cell count?

A low white blood cell count, also known as leukopenia, directly impacts the body's immune system, as white blood cells are crucial for fighting infections and diseases. When the count of these cells is reduced, the body's ability to respond effectively to pathogens is compromised, leading to an increased susceptibility to infections.

This means that individuals with a low white cell count are at a significantly higher risk of developing infections, as their immune defenses are weakened. On the other hand, the other options—more frequent headaches, chronic pain, and persistent cough—may occur due to various health conditions but are not directly related to the immediate consequences of a low white blood cell count. Instead, they might be symptoms of different medical issues that do not primarily involve an impaired immune response.