My mother is in the advanced stage of alzheimers. She has recently developed a cough for no reason. Check x-ray reveals the lungs are clear, no runny nose, no fever, no allergies ever. They put her on some acid reflux medicine because they thought she might be having some problem with acid reflux, but she still has the cough. Could she be aspirating a little after eating? Could this be as simple as a new habit?