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Nausea is a non-specific symptom, which means that it has many possible causes. Some common causes of nausea are gastroenteritis and other gastrointestinal disorders , food poisoning , motion sickness , dizziness , migraine , fainting , low blood sugar , anxiety , hyperthermia , dehydration and lack of sleep .
Malaise is a non-specific symptom and can be present in the slightest ailment, such as an emotion (causing fainting, a vasovagal response) or hunger (light hypoglycemia [2]), to the most serious conditions (cancer, stroke, heart attack, internal bleeding, etc.).
Episodes of vasovagal syncope are typically recurrent and usually occur when the predisposed person is exposed to a specific trigger. Before losing consciousness, the individual frequently experiences early signs or symptoms such as lightheadedness, nausea, the feeling of being extremely hot or cold (accompanied by sweating), ringing in the ears, an uncomfortable feeling in the heart, fuzzy ...
Causes range from non-serious to potentially fatal. [1] There are three broad categories of causes: heart or blood vessel related; reflex, also known as neurally mediated; and orthostatic hypotension. [1] Issues with the heart and blood vessels are the cause in about 10% and typically the most serious while neurally mediated is the most common. [1]
The hallmark feature of ME/CFS is a worsening of symptoms after exertion, known as post-exertional malaise or post-exertional symptom exacerbation. [6] PEM involves increased fatigue and is disabling. It can also include flu-like symptoms, pain, cognitive difficulties, gastrointestinal issues, nausea, and sleep problems. [10]: 6
The biggest differences between criteria are whether post-exertional malaise (PEM) is required, and the number of symptoms needed. [ 1 ] The pathology of ME/CFS is poorly understood, and it can be a difficult condition to diagnose because there is no standard test, many symptoms are non-specific, and because doctors and patients may be ...
These include fever, shivering, chills, malaise, dry cough, loss of appetite, body aches, nausea, and sneezing typically in connection with a sudden onset of illness. [1] In most cases, the symptoms are caused by cytokines released by immune system activation, [citation needed] and are thus relatively non-specific.
Post-exertional malaise (PEM) and exercise intolerance are common symptoms of post-acute infection syndromes. [5] Post-exertional malaise is a worsening of symptoms after minimal physical or mental activity, [6] and is a cardinal symptom of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS). [7]