| Symptom |
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Some symptoms (e.g. nausea) occur in a wide range of disease processes, whereas other symptoms are fairly specific for a narrow range of illnesses: for example, a sudden loss of sight in one eye has only a very limited number of possible causes. Some symptoms can be misleading to the patient or the medical practitioner caring for them. For example, Inflammation Of The Gallbladder quite often gives rise to pain in the right shoulder, which might (quite reasonably) lead the patient to attribute the pain to a non-abdominal cause such as muscle strain, rather than the real cause. The term "Presenting symptom" or "Presenting complaint" is used to describe the initial concern which brings a patient to a doctor. A symptom can more simply be defined as any feature which is noticed by the patient. A sign is noticed by the doctor or others. It is not necessarially the nature of the sign or symptom which defines it, but who observes it. Clearly then, the same feature may be noticed by both doctor and patient, and so is at once both a sign and a symptoms. The distinction is as simple as this, and therefore it may be nonsensical to argue whether a particular feature is a sign or a symptom. It may be one, the other, or both, depending on the observer(s). Some features, such as pain, can only be symptoms. A doctor can not feel a patient's pain (unless he is the patient!). Others can only be signs, such as a blood cell count measured by a doctor and his/her laboratory. See also Reference
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