Signs and symptoms Contents



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Nonspecific symptoms[edit]

Nonspecific symptoms are very general that can be associated with a wide range of conditions. They are also known as constitutional symptoms when they affect the sense of well-being. The symptoms include weight loss, headache, pain, fatigue, loss of appetite, night sweats, and malaise.[14] A constitutional symptom may be primary or secondary.



Vital signs[edit]

Vital signs are the four signs that can give an immediate measurement of the body”s overall functioning and health status. They are temperatureheart ratebreathing rate, and blood pressure. The ranges of these measurements vary with age, weight, gender and with general health.[15]

A digital application has been developed for use in clinical settings that measures three of the vital signs (not temperature) using just a smartphone, and has been approved by NHS England. The application is registered as Lifelight First, and Lifelight Home is under development (2020) for monitoring-use by people at home using just the camera on their smartphone or tablet. This will additionally measure oxygen saturation and atrial fibrillation. Other devices are then not needed.[16]



Syndromes[edit]

Further information: List of syndromes and List of medical triads, tetrads, and pentads

Many conditions are indicated by a group of known signs, or signs and symptoms. These can be a group of three known as a triad; a group of four known as a tetrad, and a group of five known as a petrad. An example of a triad is Meltzer's triad presenting purpura a rash, arthralgia painful joints, and myalgia painful and weak muscles. Meltzer's triad indicates the condition cryoglobulinemiaHuntington's disease is a neurodegenerative disease that is characterized by a triad of motor, cognitive, and psychiatric signs and symptoms.[17] A large number of these groups that can be characteristic of a particular disease are known as a syndromeNoonan syndrome for example, has a diagnostic set of unique facial and musculoskeletal features.[18] Some syndromes such as nephrotic syndrome may have a number of underlying causes that are all related to diseases that affect the kidneys.[19]

Sometimes a child or young adult may have symptoms suggestive of a genetic disorder that cannot be identified even after genetic testing. In such cases the term SWAN (syndrome without a name) may be used. Often a diagnosis may be made at some future point when other more specific symptoms emerge but many cases may remain undiagnosed. The inability to diagnose may be due to a unique combination of symptoms or an overlap of conditions, or to the symptoms being atypical of a known disorder, or to the disorder being extremely rare.[20]


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