Symptoms are physical conditions that indicate the illness, and are usually described as either strong, mild, or weak. Many illnesses have symptoms in common, such as nausea, high blood pressure, etc., whereas other symptoms are rarer and specific to a narrow range of illnesses. The most important symptom that leads to a diagnosis is called a cardinal symptom, and the symptoms that cause a patient to seek medical help are referred to as presenting symptoms.
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How is the most important symptom that leads to a diagnosis called?