<unk> , or<unk> , sometimes called Riley-Day syndrome is a disorder of the autonomic nervous system which affects the development and survival of sensory, sympathetic and some parasympathetic neurons in the autonomic and sensory nervous system resulting in variable symptoms including: insensitivity to pain, inability to produce tears, poor growth, and labile blood pressure (episodic hypertension and postural hypotension). People with<unk>  have frequent vomiting crises, pneumonia, problems with speech and movement, difficulty swallowing, inappropriate perception of heat, pain, and taste, as well as unstable blood pressure and gastrointestinal dysmotility.<unk>  does not affect intelligence. Originally reported by Riley, et al. in 1949,<unk>  is one example of a group of disorders known as hereditary sensory and autonomic neuropathies HSAN. All HSAN are characterized by widespread sensory dysfunction and variable autonomic dysfunction caused by incomplete development of sensory and autonomic neurons. The disorders are believed to be genetically distinct from each other.
Familial dysautonomia
Bartter syndrome
Pseudo-Bartter syndrome
Avasthey syndrome
Blind loop syndrome
West syndrome
Achard-Thiers Syndrome
Grange syndrome