This is slightly incorrect, because inflammation is not only triggered by "diseases". Inflammation indeed hurts the body. Some of the weapons it deploys, for ex

This is slightly incorrect, because inflammation is not only triggered by "diseases". Inflammation indeed hurts the body. Some of the weapons it deploys, for example Neutrophil extracellular traps (basically, playing Spider Man with webs of DNA) make subsequent cadiovascular disease more likely. Others are just generally bad for the body or uncomfortable (fever, ratches, ulcers). Chronic systemic inflammation is known to play a role in the development and progression of coronary heart disease and diabetes, and accelerate the transformation of the immune system into an aged state, which makes it more likely to develop immune system disregulations such as autoimmune diseases, and to cause cytokine storms when exposed to agents such a N1H1, Epstein-Barr or Covid. The immune system consists of many moving parts coordinating each other via the exchange of signalling molecules, which results in a large distributed system with lots of unintuitive emergent behaviors. We are only just starting to understand what effects our everyday behavior has on the immune system, and what happens to it when we age.