Blood cancer can affect the immune system in several ways. The immune system, which is responsible for fighting off infections and diseases, may be compromised as a result of blood cancer. Cancerous cells can disrupt the normal production and function of immune cells, such as white blood cells, which are essential for fighting infections. Additionally, cancer treatments like chemotherapy and radiation therapy can further weaken the immune system by destroying healthy cells along with cancerous ones.

As a result, individuals with blood cancer may be more susceptible to infections, including bacterial, viral, and fungal infections. They may also experience prolonged or severe infections due to the inability of their weakened immune system to effectively combat pathogens. Furthermore, blood cancer can affect the production of antibodies and other immune molecules, reducing the body's ability to recognize and neutralize foreign invaders. Overall, blood cancer can compromise the immune system's ability to protect the body from infections, making it essential for individuals with blood cancer to take precautions to minimize their risk of infection and seek prompt medical attention if they develop signs of infection.