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A medical sign is an objective indication of a disease, injury, or abnormal physiological state that may be detected during the physical examination of a patient. These signs can be detectable by anyone, e.g. the temperature or blood pressure of the patient, skin that is redder than usual, or a bruise; others may have no meaning to the patient or may even go completely unnoticed. Medical signs assist a healthcare provider to reach an accurate diagnosis. A symptom is something, such as pain or dizziness, experienced by the patient. Signs and symptoms are not mutually exclusive. In other words, many symptoms such as feeling hot, are associated with a medical sign such as a thermometer reading showing an above average body temperature. Symptoms and signs are often nonspecific, but certain combinations can be suggestive of certain diagnoses, helping to narrow down what may be wrong. In other cases they are specific even to the point of being pathognomonic. Examples of signs include elevated blood pressure, clubbing of the ends of fingers as a sign of lung disease, staggering gait, and arcus senilis of the eyes. In medicine, a sign is distinguished from an indication; a specific reason for using a treatment.
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