What is a common sign of infection?

A common sign of infection includes redness, heat, swelling, and pain in the affected area. This cluster of symptoms arises from the body's inflammatory response to an infection. When pathogens invade the body, the immune system responds by increasing blood flow to the affected area, leading to redness and warmth. The accumulation of fluid and immune cells contributes to swelling, while pain often results from irritation of the surrounding tissues and nerves. Recognizing these signs is essential for timely intervention and treatment of infections.

In contrast, increased energy is not typically associated with infection and may suggest wellness or a lack of stress. Clear skin indicates a lack of rash or visible infection, which contradicts the presence of infection. A decreased appetite can occur due to various reasons, including illness; however, it alone does not specifically indicate an infection and may be attributed to other conditions or psychological factors. Understanding these clinical signs is important for caregivers in monitoring health and responding appropriately.