"AH" stands for "Adenosine Hypersensitivity," a condition where the body reacts strongly to adenosine, a molecule involved in energy transfer and signaling in cells. This hypersensitivity can lead to various symptoms, including fatigue, headaches, and increased heart rate. It is often associated with certain medical conditions or genetic factors. In some cases, individuals with AH may experience heightened responses to caffeine or other stimulants, as these substances can affect adenosine levels. Understanding AH is important for managing symptoms and improving quality of life for those affected. Treatment options may include lifestyle changes and medications.