Chemical sensitivity, also known as multiple chemical sensitivity (MCS), is a condition where individuals experience adverse reactions to low levels of various chemicals found in everyday products. These chemicals can include those in perfumes, cleaning agents, pesticides, and building materials. Symptoms may range from headaches and fatigue to respiratory issues and skin irritations. People with chemical sensitivity often report that their symptoms are triggered by exposure to specific substances, even in small amounts. The exact cause of MCS is not well understood, and it is a topic of ongoing research. Treatment typically focuses on avoiding triggers and managing symptoms rather than a definitive cure.