Signs and symptoms Contents



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Signs and symptoms



Contents

  • 1Signs versus symptoms

  • 2Terms

  • 3History

  • 4Diagnosis

  • 5Examples of signs and symptoms

  • 6See also

  • 7References

Signs versus symptoms

Signs are different from experienced symptoms. A sign of a disorder is something that may be observed by another or detected during a medical examination or procedure.[3] For example high blood pressure may be noted as a sign during an examination for which there have been no reported symptoms. A symptom is something experienced and reportable by a person such as a headache or fatigue. Signs and symptoms may overlap, such as a bloody nose, which the individual experiences as unusual (symptom) and which others observe (sign).

The CDC lists various diseases by their signs and symptoms such as for measles which includes a high fever, conjunctivitis, and cough, followed a few days later by the measles rash.[7]

Terms

When a disease is evidenced by symptoms it is known as symptomatic. There are many conditions including subclinical infections that display no symptoms, and these are termed asymptomatic. Signs and symptoms may be mild or severe, brief or longer-lasting when they may become reduced (remission), or then recur (relapse or recrudescence) known as a flare-up. A flare-up may show more severe symptoms.[8]



The term chief complaint, also "presenting problem", is used to describe the initial concern of an individual when seeking medical help, and once this is clearly noted a history of the present illness may be taken. The symptom that ultimately leads to a diagnosis is called a cardinal symptom.[citation needed]

Some symptoms can be misleading as a result of referred pain, where for example a pain in the right shoulder may be due to an inflamed gallbladder and not to presumed muscle strain.[9]



Prodrome[edit]

Many diseases have an early prodromal stage where a few signs and symptoms may suggest the presence of a disorder before further specific symptoms may emerge. Measles for example has a prodromal presentation that includes a hacking cough, fever, and Koplik's spots in the mouth.[10] Over half of migraine episodes have a prodromal phase.[11] Schizophrenia has a notable prodromal stage,[12] as has dementia.[13]




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