What are undesirable consequences of the immune system known as?

The term that describes undesirable consequences of the immune system is "auto-immune disorder." These disorders occur when the immune system mistakenly attacks the body's own healthy cells and tissues, believing them to be foreign invaders. This misdirected immune response can lead to a variety of conditions, such as rheumatoid arthritis, lupus, and Type 1 diabetes, among others.

Auto-immune disorders highlight the complexity of the immune system and its ability to differentiate between self and non-self. When this balance is disrupted, it results in various health problems that can significantly affect an individual's well-being.

In contrast, allergies refer to hypersensitive responses to typically harmless substances, which, although undesirable for those affected, are distinct from auto-immune disorders. Immunity refers to the body's ability to resist diseases, representing a positive response of the immune system. Defense mechanisms encompass various strategies employed by the immune system to combat infections and diseases, again indicating a protective and beneficial role, rather than an undesirable consequence.