"A symptom (from Greek \u03C3\u03CD\u03BC\u03C0\u03C4\u03C9\u03BC\u03B1, \"accident, misfortune, that which befalls\", from \u03C3\u03C5\u03BC\u03C0\u03AF\u03C0\u03C4\u03C9, \"I befall\", from \u03C3\u03C5\u03BD- \"together, with\" and \u03C0\u03AF\u03C0\u03C4\u03C9, \"I fall\") is a departure from normal function or feeling which is noticed by a patient, reflecting the presence of an unusual state, or of a disease. A symptom is subjective, observed by the patient, and cannot be measured directly, whereas a sign is objectively observable by others."@en .