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Seasickness is a form of terrestrial motion sickness characterized by a feeling of nausea and, in extreme cases, vertigo experienced after spending time on a boat. [12] It is essentially the same as carsickness, though the motion of a watercraft tends to be more regular.
Some also report difficulty concentrating, blurred vision, tremulousness, vertigo, anxiety, palpitations (awareness of the heartbeat), unsteadiness, feeling sweaty or clammy, and sometimes nausea. A person may look pale. [12] Some people may experience severe orthostatic hypotension with the only symptoms being confusion or extreme fatigue.
If a patient is unable to keep fluids down from nausea or vomiting, they may need intravenous fluids such as Ringer's lactate solution. They should try eating something sugary and lying down or sitting and reducing the elevation of the head relative to the body (for example, by positioning the head between the knees).
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There are 18.1–39.7 syncope episodes per 1000 people in the general population. Rates are highest between the ages of 10–30 years old. This is likely because of the high rates of vasovagal syncope in the young adult population. Older adults are more likely to have orthostatic or cardiac syncope.
“In adults over the age of 65, symptoms almost always include a cough, whereas with the flu, coughing is usually just present in about two-thirds of patients,” he says.
Symptoms, which include nausea, lightheadedness, and cognitive impairment, often improve again after lying down. [12] Weakness and vision changes may also be triggered by the upright posture. [3] Some have postural orthostatic tachycardia syndrome (POTS), an excessive increase in heart rate after standing up, which can result in fainting.
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