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Postural orthostatic tachycardia syndrome (POTS) is a condition characterized by an abnormally large increase in heart rate upon sitting up or standing. [1] POTS is a disorder of the autonomic nervous system that can lead to a variety of symptoms, [10] including lightheadedness, brain fog, blurred vision, weakness, fatigue, headaches, heart palpitations, exercise intolerance, nausea ...
In patients with multiple sclerosis (MS), heat intolerance may cause a pseudoexacerbation, which is a temporary worsening of MS-related symptoms. A temporary worsening of symptoms can also happen in patients with postural orthostatic tachycardia syndrome (POTS) and dysautonomia. [citation needed]
Orthostatic intolerance (OI) is the development of symptoms when standing upright that are relieved when reclining. [1] There are many types of orthostatic intolerance. OI can be a subcategory of dysautonomia , a disorder of the autonomic nervous system [ 2 ] occurring when an individual stands up. [ 3 ]
Dysautonomia, autonomic failure, or autonomic dysfunction is a condition in which the autonomic nervous system (ANS) does not work properly. This may affect the functioning of the heart, bladder, intestines, sweat glands, pupils, and blood vessels.
Symptoms such as nausea, muscle cramps, a racing pulse and mild dizziness could all suggest heat exhaustion. These are signals to find a cool place, rest, drink fluids and even use ice packs ...
Recently several studies have suggested an association between autonomic small fiber neuropathy and postural orthostatic tachycardia syndrome [6] [7] [8] Other notable studies have shown a link between erythromelalgia, [9] fibromyalgia, [10] Ehlers–Danlos Syndrome [11] and long covid.
Others also experience a condition called nonallergic rhinitis, a condition that causes allergy-like symptoms — stuffy, runny nose, for instance — that aren't related to allergies.
Da Costa's syndrome, also known as soldier's heart among other names, was a syndrome or a set of symptoms similar to those of heart disease.These include fatigue upon exertion, shortness of breath, palpitations, sweating, chest pain, and sometimes orthostatic intolerance.