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Which conditions can cause chronic inflammation without an earlier acute inflammation?
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A doctor examining chest X-rays of patients infected with tuberculosis, which remains one of the world's deadliest diseases.
While chronic inflammation often follows an acute response, it can also emerge as an independent process. This occurs when the body encounters persistent agents that resist host defenses or when the immune system mistakenly targets normal bodily components.1
Conditions that can cause chronic inflammation without a preceding acute phase include:
- Infectious diseases: Certain organisms, such as fungi, protozoa, metazoal parasites, and Mycobacterium tuberculosis (the causative agent of tuberculosis), can persist in tissues for extended periods, triggering a chronic response.1
- Autoimmune reactions: In these disorders, the immune system becomes sensitized to normal components of the body. A primary example is rheumatoid arthritis, where the body’s own tissues are targeted, leading to persistent inflammation.12
- Exposure to foreign materials: Chronic inflammation can be initiated by substances that cannot be removed by phagocytosis or enzymatic breakdown. Examples include inhaled materials like silica dust or foreign objects such as wood or metal splinters that gain entry to wounds.1
These conditions are often characterized by the infiltration of macrophages, lymphocytes, and plasma cells at the site of inflammation.1