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Inflammation
Inflammation supports defence and repair, but persistent or misdirected responses can also harm tissues.
#Injury can trigger inflammation without infection
OpenStax describes inflammation as part of innate defence that can follow tissue damage as well as infection. Released contents of injured cells can stimulate the response even when microbes have not entered through a broken barrier. MedlinePlus likewise lists trauma, heat and other causes alongside bacteria.
Inflammation and infection are therefore not interchangeable names. One describes a response of the body; the other concerns infectious agents and their interaction with the host. A general explanation cannot identify the cause of a person's painful or swollen area.
Evidence: OpenStax Anatomy and Physiology 2e: innate defence and inflammation / MedlinePlus: immune response
#Signals change local vessels and recruit cells
OpenStax explains that inflammatory mediators can increase local blood flow and make vessels more permeable, allowing fluid to move into tissues. Signals also attract phagocytes, cells that engulf microbes and cellular debris. These changes help account for warmth, redness and swelling in its introductory tissue-injury model.
The response brings cells and materials to the affected area and prepares for repair. Those mechanisms are educational examples, not a checklist for diagnosing inflammation in every organ. This page does not infer infection from redness, interpret a blood marker or select an anti-inflammatory medicine.
Evidence: OpenStax Anatomy and Physiology 2e: innate defence and inflammation / MedlinePlus: immune response
#A continuing response can also damage tissue
OpenStax distinguishes a short-term acute response from ongoing chronic inflammation. Persistent microbes, foreign material and autoimmune conditions are among its examples of continuing causes. Chronic inflammation can be associated with tissue damage and fibrosis, rather than completing repair successfully.
NIAID also notes that a response that continues after danger passes can cause problems. The useful question is how a response is regulated in its context, not whether all inflammation should be increased or suppressed. This page supplies no timing threshold, treatment plan or diet for an individual's inflammatory condition.
Evidence: OpenStax Anatomy and Physiology 2e: innate defence and inflammation / NIAID: overview of the immune system
Source note
The sections above were checked against the linked sources. No clinical review has been performed. This is general research education, not a clinical guideline.