An important component of the immune system is the lymphatic or lymphatic system. It is a network of arteries and lymph nodes. Thin tubes known as lymphatic vessels are found throughout the body and branch like blood veins. They transport lymph, a transparent fluid. Immune system cells, waste materials, and tissue fluid are all present in lymph. Small, bean-shaped immune cell clusters known as lymph nodes are linked by lymphatic veins. They include white blood cells, which are capable of capturing intruders like cancer cells as well as viruses and germs. Immune system disorders are when the immune system does not function as it should. Severe combined immune system (SCID). This is an illustration of an immunological disorder that exists from birth. Children are always at risk for bacterial, viral, and fungal illnesses. Sometimes, this condition is referred to as "bubble boy disease." Temporary acquired immune deficiencies, for instance, several medications might impair your immune system. People using chemotherapy or other cancer-treating medications may experience this. Additionally, it can occur in recipients of organ transplants who take medication to avoid organ rejection. Infections like the measles, mono (mononucleosis), and the flu virus can also temporarily impair immunity. Additionally, unhealthy eating habits, alcoholism, and smoking might impair your immune system. AIDS, An acquired viral infection called HIV, which results in AIDS, kills crucial white blood cells and impairs the immune system. People with HIV/AIDS get severe infections that the majority of people can fend off. Opportunistic infections are what these illnesses are known as because they profit from weakened immune systems.