Infection, The invasion and multiplication of a pathogen inside the body. The body's immune system usually responds to fight the invader. An infection may cause no damage or symptoms, and it does not always lead to disease., Disease, The objective, biological disruption of normal bodily functions or structures. In infectious cases, this happens when the pathogen, its toxins, or the body's own immune response disrupt normal function, producing signs that can be observed during examination or detected through tests., Pathogen, The biological agent or "invader" (such as a bacterium, virus, fungus, or protozoan) that is capable of causing disease in a host., Illness, The subjective, personal experience of being unwell. This is how the individual feels, reacts to, and copes with their symptoms (e.g., fatigue, anxiety, or pain). A person can have a disease without feeling ill, such as early high blood pressure, and can feel ill without any disease being found.

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