How low-grade inflammation differs from acute inflammation
Acute inflammation is a sharp, self-limiting response to injury or infection that resolves once the threat is cleared. Chronic low-grade inflammation is a persistent, smoldering elevation of inflammatory signaling that produces no obvious redness or swelling but keeps circulating markers modestly raised over months or years. It is sometimes described in the literature as meta-inflammation when it tracks with metabolic stress.
Commonly measured markers include C-reactive protein (CRP), interleukin-6 (IL-6), and tumor necrosis factor (TNF). High-sensitivity CRP in particular is used in research and some clinical settings to gauge background inflammatory tone, though a single value reflects many short-term factors.
Why it is associated with chronic disease
Sustained inflammatory signaling is statistically associated with insulin resistance, atherosclerosis, and several neurodegenerative processes. The proposed mechanisms involve immune cells infiltrating tissues such as adipose and arterial walls, where they sustain cytokine release that interferes with normal metabolic and vascular function.
These are associations and plausible mechanisms, not proof that inflammation alone causes any one disease, since lifestyle, genetics, and other exposures contribute. Anyone interpreting their own inflammatory markers should do so with a qualified clinician; this is general educational information, not medical advice.