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What Is Inflammation

Updated: a day ago



Inflammation is the body's response to injury. It works to heal wounds, but it can also play a role in some chronic diseases.

Inflammation is a vital part of the immune system's response to injury and infection. It is the body's way of signaling the immune system to heal and repair damaged tissue, as well as defend itself against foreign invaders, such as viruses and bacteria.  Without inflammation as a physiological response, wounds would fester, and infections could become deadly.  However, if the inflammatory process goes on for too long or if the inflammatory response occurs in places where it is not needed, it can become problematic. Chronic inflammation has been linked to certain diseases such as heart disease or stroke, and may also lead to autoimmune disorders, such as rheumatoid arthritis and lupus. But a healthy diet and lifestyle can help keep inflammation under control. 

Acute inflammation occurs after a cut on the knee, a sprained ankle or a sore throat. It's a short-term response with localized effects, meaning it works at the precise place where a problem exists. The telltale signs of acute inflammation include redness, swelling, heat and sometimes pain and loss of function, according to the National Library of Medicine. In the case of acute inflammation, blood vessels dilate, blood flow increases and white blood cells swarm the injured area to promote healing, this response is what causes the injured area to turn red and become swollen. During acute inflammation, chemicals known as cytokines are released by the damaged tissue. The cytokines act as "emergency signals" that bring in your body's immune cells, hormones and nutrients to fix the problem. In addition, hormone-like substances known as prostaglandins create blood clots to heal damaged tissue, and they also trigger pain and fever as part of the healing process. As the body heals, the acute inflammation gradually subsides.

Chronic inflammation Unlike acute inflammation, chronic inflammation can have long-term and whole-body effects. Chronic inflammation is also called persistent, low-grade inflammation because it produces a steady, low-level of inflammation throughout the body, as judged by a small rise in immune system markers found in blood or tissue. This type of systemic inflammation can contribute to the development of disease, according to a summary in the Johns Hopkins Health Review. Low levels of inflammation can be triggered by a perceived internal threat, even when there isn't a disease to fight or an injury to heal, and sometimes this signals the immune system to respond. As a result, white blood cells swarm but have nothing to do and nowhere to go, and they may eventually start attacking internal organs or other healthy tissues and cells.  Researchers are still working to understand the implications of chronic inflammation on the body and the mechanisms involved in the process, but it's known to play a role in the development of many diseases. For example, chronic inflammation has been linked to heart disease and stroke. One theory suggests that when inflammatory cells stay too long in blood vessels, they promote the buildup of plaque. The body perceives this plaque as a foreign substance that doesn't belong, so it tries to wall off the plaque from the blood flowing inside the arteries, according to the American Heart Association(AHA). If the plaque becomes unstable and ruptures, it forms a clot that blocks blood flow to the heart or brain, triggering a heart attack or stroke. Cancer is another disease linked with chronic inflammation. Over time, chronic inflammation can cause DNA damage and lead to some forms of cancer, according to the National Cancer Institute. Chronic, low-grade inflammation often does not have symptoms, but doctors can test for C-reactive protein (CRP), a marker for inflammation in the blood. High levels of CRP have been linked with an increased risk of heart disease. CRP levels can also indicate an infection, or a chronic inflammatory disease, such as rheumatoid arthritis or lupus, according to the Mayo Clinic. Besides looking for clues in the blood, a person's diet, lifestyle habits and environmental exposures can contribute to chronic inflammation. It's important to maintain a healthy lifestyle to keep inflammation in check. Anti-inflammatory diet Anti-inflammatory diets have become popular in recent years. The recommended foods are typical of a Mediterranean diet and include eating more fish, fresh fruits and vegetables, and healthy fats; eating moderate amounts of nuts; eating very little red meat; and drinking red wine in moderation. Like the Mediterranean diet, the principles of an anti-inflammatory diet are healthful ones and the approach is nutritionally sound, according to the Mayo Clinic. "Anti-inflammatory food components, such as omega-3 fats, protect the body against the possible damage caused by inflammation," said Ximena Jimenez, a Miami-based nutritionist and spokesperson for the Academy of Nutrition and Dietetics. An anti-inflammatory diet also means staying away from foods that can promote inflammation. It's best to minimize the amount of foods you eat that are high in saturated and trans fats, such as red meats, dairy products and foods containing partially hydrogenated oils, according to the University of Wisconsin. In addition, limit sugary foods and refined carbohydrates, such as white rice and bread. Several dietary supplements are said to have anti-inflammatory properties, such as devil's claw, turmeric and willow bark. Although there is some limited evidence that a few natural products may provide modest benefits for acute inflammation, in general, there is insufficient evidence to support the use of many of these products for inflammatory conditions, according to the National Center for Complimentary and Integrative.


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