Immunology is the study of the immune system and all its aspects, such as its structure, function, disorders, and immunization.
The immune system protects the body from infections using various defense methods, including innate and adaptive immunity. It is a highly regulated system, and a slight disturbance can cause significant effects.
In addition to causing certain diseases such as allergies, autoimmunity, and cancer, it is now known that immune responses contribute to other health conditions not viewed as traditionally immunologic, such as cardiovascular disease, metabolic disorders, and neurodegenerative conditions. With these connections, immunology can play a role in all these health conditions.