Inflammation is a natural response of the body to protect itself against foreign invaders, such as bacteria, viruses, toxins, and other microorganisms. It is a result of the body’s attempt to defend itself by sending white blood cells and other molecules to the infected or damaged area. These molecules can cause the area to become red, swollen, and painful, which are all signs of inflammation. Microbes are one of the main causes of inflammation. They can enter the body through cuts, wounds, or other breaks in the skin, as well as through the air, food, or water. Once inside, they can cause infections, which lead to inflammation. The presence of bacteria, viruses, fungi, and other microorganisms can trigger an inflammatory response, which can cause swelling, pain, and other symptoms. In addition to microbes, other factors can also lead to inflammation. These include physical trauma, such as a cut or bruise; environmental factors, such as exposure to UV rays or pollutants; and allergies, which can cause inflammation when the body is exposed to an allergen. Autoimmune diseases, such as rheumatoid arthritis, can also cause inflammation by causing the body to mistakenly attack its own tissues and organs.