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by author Sherry Torkos, BScPharm
Inflammation is a process by which the body’s immune system reacts to infection, contact with foreign substances, or injury. It happens when you stub your toe, contract a virus, or are exposed to a harsh chemical. Your immune system mounts a defence by releasing various chemicals which increase blood flow to the area, causing some or all of the following symptoms: redness, swelling, warmth, and pain. Inflammation may also be associated with flu-like symptoms such as fever, chills, fatigue, and aching. Although inflammation is a natural process designed to help the body fight infection and promote healing, in some cases the body’s immune system overreacts, or reacts inappropriately. Such is the case with autoimmune diseases where the body’s normally protective immune system causes damage to its own tissues. Lifestyle factors such as stress, poor diet, and lack of sleep also contribute to inflammation. While there are often obvious signs of acute inflammation, such as redness and swelling, chronic inflammation, which occurs from lifestyle factors, can be more insidious. It can affect many body tissues including blood vessels, organs, and nerves with few or no obvious signs until a serious health problem develops. Researchers have identified inflammation as a factor in the development and progression of many chronic diseases, so it is essential to be aware of the factors that trigger inflammation as well as approaches to keep this process in check. Inflammation and Disease There is no debate that many chronic diseases are associated with inflammation. Below are some of the most common and concerning of these. Arthritis This general term is used to describe various inflammatory conditions in the body. There are over 100 forms of arthritis, including rheumatoid arthritis, gout, lupus, fibromyalgia, osteoarthritis, and Sjögren’s syndrome. These diseases involve joint and musculoskeletal pain, and are often a result of inflammation of the joint lining. Some forms of arthritis, such as rheumatoid arthritis and lupus, are caused by autoimmune responses, and others, such as osteoarthritis, are caused by wear and tear to the joint, which leads to inflammation. Cancer Chronic inflammation resulting from infection or chemical exposure has been identified as a risk factor for various forms of cancer. For example, research has found strong associations for:
These studies demonstrate that inflammation promotes tumour development. Cancer and inflammation share another connection. It has been found that chronic inflammation occurs due to tumour environment stress and that this generates a protective shield from the immune system. In other words, inflammation protects the tumour from attack by the immune system. Researchers have found that the release of inflammatory compounds such as cytokines, leucocytes, lymphocytes, and macrophages contributes to progression and metastasis (spreading from the original tumour site). Furthermore, this inflammatory response can compromise the response to chemotherapy. Diabetes Mounting research links uncontrolled high levels of blood glucose to inflammation, which can lead to diabetic complication such as neuropathy, retinopathy, and nephropathy. Researchers have found that high levels of blood glucose lead to glycation and oxidation of proteins, lipids, and nucleotides, resulting in the formation of advanced glycation end products (AGEs). It is thought that AGEs trigger various inflammatory processes which can lead to damage of the blood vessels throughout the body. Thus, controlling blood sugar is vital to the prevention of inflammation and diabetic complications. Heart Disease Studies suggest that inflammation plays a role in the development of atherosclerosis, the process in which fatty deposits build up in the inner lining of arteries, increasing the risk of heart attack and stroke. Factors that promote atherosclerosis, including cigarette smoking, hypertension, atherogenic lipoproteins, and hyperglycemia, give rise to a variety of noxious stimuli that cause the release of chemicals and the activation of cells involved in the inflammatory process. These events contribute not only to the formation of plaque, but may also contribute to its disruption, resulting in the formation of a blood clot.
Sherry Torkos, BScPharm, is a pharmacist and author of The Canadian Encyclopedia of Natural Medicine (Wiley, 2008). sherrytorkos.com Source: alive #310, August 2008 |
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