All the hype around inflammation may make it seem like a Big Bad, but it's actually a fundamental part of the body's reaction to threats and foreign matter. Scientists have only recently discovered the mechanisms that link inflammation levels to many diseases and conditions, and there are still many elements of the picture that we don't understand. Most of us really don't have a sense of the many
facts about inflammation that we should, since it's such a fundamental body process.
The mechanism for inflammation lies in the body's immune system. "Inflammation begins with innate immune cells, such as neutrophils, being alerted to the trigger," the Walter & Eliza Hall Institute for Medical Research writes on its website. "When activated, innate immune cells can immediately
release a variety of inflammatory substances. These substances trigger the features of inflammation in nearby tissue, protecting the site and attracting an influx of additional immune cells."
Inflammation isn't meant to be a long-term issue — it's supposed to be a battle that ends pretty shortly — but in some people, either low-grade or high-level inflammation can persist for long periods. Extended inflammation, in which the inflammatory response "goes wrong" in some way, has been linked to a lot of illnesses, but that doesn't mean it's all bad. Here are 21 things you should know about inflammation.
1 Many Kinds Of Inflammation Are Actually Good
This might be the most important thing to know about inflammation: When it does what it's supposed to do, it's a good thing. The Walter & Eliza Hall Institute for Medical Research explains that inflammation helps out the body in many ways, including "
increasing blood flow and movement of immune cells into the inflamed tissue; stimulating immune cells, such as triggering macrophages to be more likely to engulf nearby substances; [and] stimulating production of new immune cells". Vaccines, they note, usually trigger inflammation that helps the immune system remember threats and how to fight them in the future. 2 High Inflammation Is Tied To Depression
High levels of inflammation,
specifically in the brain, have been shown to be tied to depression, though it's not clear whether it's cause or effect — whether people who have depression have higher inflammation in their bodies because of their mental health, or if inflammation causes neurological symptoms that influence depression. 3 And It Might Link Depression & Heart Disease
Research from Cambridge in 2019 found that people with depression tend to have
higher than normal rates of heart disease because of the presence of inflammation, often related to stress. If you're stressed and depressed, your higher inflammation levels leave you more vulnerable to heart conditions. 4 Chronic Inflammation May Increase Alzheimer's Risk 5 Having Sleep Apnea Can Increase Inflammation Levels 6 PCOS Can Increase Inflammation Too 7 Nutrition Can Lower Your Inflammation Levels Astrid Stawiarz/Getty Images Entertainment/Getty Images 8 Omega-3 Especially Helps 10 Stress Can Cause Illness Through Inflammation
If you're seriously stressed, you're more likely to be ill — and one of the ways in which this happens, according to science from 2012, is that
stress triggers inflammatory responses that then make the body less likely to fight off illnesses. 11 Inflammation Can Trigger Sleep Disorders
If you have a sleep disorder like insomnia, according to a study in 2018,
inflammation may be the cause, as it can disrupt the body's internal circadian rhythms, making sleep less restful, more irregular or more fragmented. 12 And Sleep Disorders Can Trigger Inflammation 13 Chronic Inflammation Is A Cycle
The existence of chronic inflammation, explained the Johns Hopkins Health Review in 2016, is cyclical. "Researchers have an idea that
inflammation exists as part of a self-reinforcing loop system. If they could figure out how to interrupt or reverse one stage in that loop, then they might be able to develop drugs to stop it. But how do you tone down the immune response enough to control the inflammation but not so much that a body can’t fight disease?" There's no clear answer yet. 14 There's A Burst In Inflammation After Every Meal 15 Chronic Inflammation Is Linked To Cancer
The National Cancer Institute explains that
chronic inflammation can cause cancer because of its long-term damage to DNA, which causes problems in the replication of cells that can lead to cancers. 16 Vapes & E-Cigs Are Linked To Inflammation Christopher Furlong/Getty Images News/Getty Images 17 Breast Milk Contains Anti-Inflammatory Substances 18 Exercise Can Reduce Inflammation
Even though the muscle strain you want from exercise induces a short amount of inflammation (see #1), research in 2017 found that a single
20-minute session of moderate exercise can trigger an anti-inflammatory response in the body. 19 There's Hope For Stopping Chronic Inflammation Dragon Images/Shutterstock 20 Testing For Inflammation Levels Is Getting Better
The most common way to test inflammation levels in the body is a
C-reactive protein blood test; C-reactive proteins rise in response to inflammation, so high levels of them tend to indicate inflammatory responses. However, one day tests might be more complex and refined; researchers in 2019 revealed they were developing a tool to test the effects of anti-inflammatory drugs, which one day might be used to probe exactly how inflammation affects very small areas of the body. 21
Inflammation isn't the end of the world, but at persistent chronic levels it can be linked to illnesses and conditions that can make your life more difficult. If you're worried, talk to your doctor about testing your inflammation levels and ways to reduce it.