Inflammation comes in two primary forms, each with distinct characteristics and health implications:
What is Acute Inflammation?
Acute inflammation is the body’s response to an acute injury such as a scraped elbow or sprained ankle. According to the National Library of Medicine, acute inflammation occurs localized to the injury site and may include:
- Redness
- Swelling
- Heat
- Pain
- In more extreme cases, loss of function
Cytokines are released by the damaged tissue in response to acute inflammation. These cytokines trigger immune cells, hormones, and other systems to act on the damage and heal the body. In cases of infection, the body fights off foreign invaders by raising the body’s core temperature to kill viruses and bacteria.
Another physiological process that occurs is vasodilation and increased blood flow to the inflamed area. This increased blood flow helps tissues to heal more quickly and can also lead to warmth and redness that is associated with inflammation.
Acute inflammation subsides quickly once damaged tissue is healed and the body returns to normal. If acute inflammation does not subside, it can lead to chronic inflammation.
What is Chronic Inflammation?
Researchers are continuing to work at discovering what mechanisms cause chronic inflammation to occur and the resulting implications on the body, although they do know that chronic inflammation plays a role in the development of many disease processes.
Unlike acute inflammation, chronic inflammation affects the whole body and is not localized to one specific site. It is commonly low-grade inflammation that is present at all times.
As a response to chronic inflammation, white blood cells are released by the immune system to fight a perceived threat. When there is no threat to fight, the white blood cells may start attacking healthy tissues and internal organs.
For example, chronic inflammation increases the risk of heart attack and stroke. When inflammatory cells remain in the blood vessels for a lengthy period of time, they contribute to the build-up of plaque. The immune system perceives this plaque build-up as a threat, and inflammation occurs to block off the plaque from the rest of the blood vessel. If the plaque becomes unstable or gets knocked loose, it can cause a clot to block blood flow and cause a heart attack or stroke.
Diagnosing Chronic Inflammation
Diagnosis of chronic inflammation is difficult due to a lack of outward symptoms, but a medical doctor can test for elevated levels of C-reactive protein (CRP) in the blood. If CRP levels are elevated, it signals chronic inflammation in the body which may lead to different disease processes down the road.