What occurs when people are exposed to substances that their bodies are sensitive?

When people are exposed to substances they are sensitive to, they may experience an allergic reaction or an intolerance response. Symptoms can range from mild, such as sneezing or skin irritation, to severe, including difficulty breathing or anaphylaxis. The immune system mistakenly identifies the substance as harmful, triggering an inflammatory response. This can lead to various health issues depending on the individual's sensitivity and the substance involved.