Inflammation is the body’s protective response to harmful stimuli such as pathogens, damaged cells or irritants. It has two main forms: acute and chronic. Acute inflammation develops rapidly after injury or infection. Local blood vessels dilate, blood flow increases and immune cells move into the affected tissue. This often produces the classic signs of redness, heat, swelling, pain and reduced function. In most cases, acute inflammation is tightly regulated and resolves once the threat is removed and tissue repair occurs.

Chronic inflammation is more problematic. It can arise from persistent infections, autoimmune reactions, long term exposure to irritants or failure to completely resolve an acute response. Over time, chronic inflammation can damage tissues and is linked to conditions such as atherosclerosis, type 2 diabetes, inflammatory bowel disease, asthma, rheumatoid arthritis, neurodegenerative disorders and some cancers.

At the molecular level, inflammation involves complex signaling networks. Cells release cytokines and chemokines that coordinate immune activity. Key transcription factors such as NF kappa B regulate expression of inflammatory genes. Metabolic changes inside immune cells support their activation and function. Recent work highlights how resolution of inflammation is an active process guided by specialized pro resolving mediators that help clear debris and restore tissue homeostasis.

Lifestyle and environment strongly influence inflammatory status. Diets rich in fruits, vegetables, whole grains and omega 3 fats, along with regular physical activity and quality sleep, tend to lower chronic inflammatory markers. In contrast, highly processed foods, chronic stress, air pollution and smoking promote low grade systemic inflammation. Future research is focusing on targeted therapies that modulate specific inflammatory pathways while preserving essential host defense.