AARP Hearing Center
Key takeaways
- Inflammation is a normal immune response that helps fight infection and heal injury.
- Problems arise when inflammation becomes chronic and damages organs or tissues.
- Lifestyle changes like diet, exercise, sleep and social ties can help limit inflammation.
In recent years, inflammation has become the go-to villain of health headlines, catching blame for everything from achy joints to thinking and memory problems.
But what is inflammation — and how does it shape what happens inside the body, especially after 50?
Let’s take a closer look.
Inflammation can be good — and bad
Inflammation is the body’s natural response to injury, infection and self-antigens (proteins from the body’s own cells), says Dr. Bibi Ayesha, a rheumatologist at the Montefiore Health System and associate professor of medicine at the Albert Einstein College of Medicine.
It can also be triggered by exposure to pesticides, toxins and chemicals found in ultra-processed foods or by immune reactions, such as an allergy, says Dr. Mladen Golubic, medical director of the Osher Center for Integrative Health at the University of Cincinnati.
Its classic signs are pain, heat, redness, swelling and sometimes loss of function in the affected area.
But inflammation isn’t just a signal that something’s wrong; it’s also a routine and essential part of how the body functions. For example, it helps eliminate disease-causing microorganisms, such as bacteria and parasites, and repairs damaged tissue to start the healing process, Golubic explains.
In an ideal scenario, inflammation is a short-term response that ends once the triggering circumstances are resolved and healing has occurred.
“Once the acute inflammation is set in action, it normally leads to repair of the damage and healing, and the immune system and other involved cells go back to their normal, healthy, baseline state of no inflammation,” Golubic says. “Just like the molecular mechanisms that turn the inflammation on, other biologic mechanisms turn the inflammation off.”
More From AARP
Discover the Warning Signs of Crohn’s Disease
Crohn’s disease can cause these gastrointestinal symptoms
7 Things That Can Cause Inflammation
If left unchecked, inflammation can be bad for your healthSmart Guide to Reducing Inflammation
31 ways to tamp down the chronic condition