What Is Inflammation?
Inflammation is the body’s natural response to injury. When tissue is damaged, a series of chemical changes occurs to protect the area and begin the healing process. These changes are collectively called inflammation. An injured area continues to change over time as the body repairs itself.
When an injury occurs, the body produces four classic signs of inflammation: pain (dolor), heat (calor), redness (rubor), and swelling (tumor). A simple example is a bee sting. The sting causes immediate pain from the injury itself. Shortly afterward, redness, warmth, swelling, and additional pain develop as part of the body’s response.
These changes occur because blood vessels near the injury widen, increasing blood flow to the area. White blood cells release chemical messengers—such as prostaglandins, cytokines, interleukins, and leukotrienes—that help coordinate the inflammatory response. This process begins within about 30 minutes of injury. White blood cells then migrate into the area to help manage damage and begin repair. If the injury is mild, blood vessels usually return to normal within six to eight hours, and healing continues.
What Causes Inflammation?
Inflammation occurs because white blood cells release specific chemicals in response to injury or irritation. In some cases, the response is excessive, and inflammation produces pain or discomfort that seems out of proportion to the original injury.
Many medications reduce inflammation by blocking the production of inflammatory chemicals. While this can reduce pain and swelling, it may also slow aspects of the healing process. In contrast, certain lifestyle factors—such as diet and nutrient status—can influence inflammation without necessarily interfering with repair.
You may recognize the names of some inflammatory chemicals from medication advertisements. Substances such as prostaglandins, cytokines, interleukins, and leukotrienes play major roles in inflammation. Drugs used for pain relief and allergy control work by altering these chemical signals. Diet and nutritional factors can also influence how much of these chemicals are produced and how strong the inflammatory response becomes.
