In medicine, a<unk>  is an early sign or symptom (or set of signs and symptoms) that often indicates the onset of a disease before more diagnostically specific signs and symptoms develop. It is derived from the Greek word<unk> s, meaning "running before".<unk> s may be non-specific symptoms or, in a few instances, may clearly indicate a particular disease, such as the<unk> l migraine aura. For example, fever, malaise, headache and lack of appetite frequently occur in the<unk>  of many infective disorders. A<unk>  can be the early precursor to an episode of a chronic neurological disorder such as a migraine headache or an epileptic seizure, where<unk>  symptoms may include euphoria or other changes in mood, insomnia, abdominal sensations, disorientation, aphasia, or photosensitivity. Such a<unk>  occurs on a scale of days to an hour before the episode, where an aura occurs more immediate to it.<unk> l labour, mistakenly called "false labour," refers to the early signs before labour starts.
Prodrome
Breakthrough infection
Postdrome
Exacerbation
Convalescence
Disease cluster
Window period
Pandemic fatigue