SIGNS VERSUS SYMPTOMS
The objective ones – in other words, the manifestations of the disease that can be verified by others – are called signs, while the subjective ones – which the patient feels and therefore cannot be directly verified by health professionals – are called symptoms. Pain, for instance, cannot be quantified directly; a health professional will have to confirm its existence using indirect means, such as through an elevated heart rate, as needed. In other words, it is a subjective manifestation, and is therefore called a symptom. On the other hand, fever, which can be verified directly with a thermometer, is an objective manifestation, and is referred to as a sign.