Dysautonomia refers to a disorder of autonomic nervous system (ANS) function that generally involves failure of the sympathetic or parasympathetic components of the ANS, but dysautonomia involving excessive or overactive ANS actions also can occur.
Abnormally fast or slow heart rate
Excessive sweating or not being able to sweat
Feeling short of breath (especially when you exercise)
Feeling thirsty all the time
Having trouble swallowing
Vision problems (blurred vision, vision loss, tunnel vision)
Pupil dilation and constriction in the eyes.
Body and skin temperature control
Examples of diseases in which secondary dysautonomia can occur include:
Crohnâs disease, ulcerative colitis.
Charcot-Marie-Tooth disease.
Vitamin B and E deficiencies
Human immunodeficiency virus (HIV).
Neurocardiogenic syncope (NCS):Â NCS is the most common form of dysautonomia. It can cause fainting spells that happen once or twice in your lifetime or multiple times every day. NCS is also called situational syncope or vasovagal syncope.
Postural orthostatic tachycardia syndrome (POTS): A disorder that causes problems with circulation (blood flow), POTS can cause your heart to beat too fast when you stand up. It can lead to fainting, chest pain and shortness of breath.
Familial dysautonomia (FD):Â People inherit this type of dysautonomia from their genetic relatives. It can cause decreased pain sensitivity, lack of eye tears and trouble regulating body temperature. FD is more likely to affect Jewish people (Ashkenazi Jewish heritage) of Eastern European heritage.
Multiple system atrophy (MSA): A life-threatening form of dysautonomia, multiple system atrophy develops in people over 40 years old. It can lead to heart rate issues, low blood pressure, erectile dysfunction and loss of bladder control.
Pure autonomic failure:Â People with this form of dysautonomia experience a fall in blood pressure upon standing and have symptoms including dizziness, fainting, visual problems, chest pain and tiredness. Symptoms are sometimes relieved by lying down or sitting.
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