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The term "prodromal" refers to the early stage of a disease or illness, characterized by symptoms that signal its impending onset. These symptoms, known as a prodrome, often appear before the more definitive signs of the illness.12

Examples of prodromal symptoms can include general feelings of malaise, fever, chills, headache, muscle aches, and vomiting. In some cases, such as with Alzheimer's disease, a prodromal stage is recognized before the full manifestation of the condition. This phase is crucial for early detection and intervention in various medical contexts.12

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