What if your worst childhood memories, hidden stress, and fears weren't just stored in your mind, but could also influence how your genes function? When you get sick, your doctor usually looks for a physical cause, such as a viral infection, a genetic issue, or a faulty cell. However, modern medicine is increasingly exploring how psychological stress can affect physical health through a field known as psychoneuroimmunology (PNI). PNI explores how the mind, nervous system, and