1) Flu omens 2) Signs 3) WebMD data 1) Signs 
The outward appearance of a plant, which is attacked by a disease or insect.
Abnormal, usually unpleasant, sensations or changes in the body that indicate a disease process or other medical problem.
What the patient describes.
Any perceptible, subjective change in the body or its functions that indicates disease or phases of disease, as reported by the patient.
symptoms (and general pathology) The manifestations of disease and pathological conditions that may occur in various diseases and different organs.
A physical feature that is regarded as indicating a condition of disease.