In 2005 Wikipedia's first sentence called it “disorder of the autonomic nervous system resulting in variable syptoms including insensivity to pain”. Today it says “rare”.
Measured, not asserted. Every count, date and revision on this page was taken from Wikipedia's own history and checked against the live article. The words quoted are theirs.
Machine-checked against the full current article on 2026-08-02. In 2005 Wikipedia's first sentence called it “disorder of the autonomic nervous system resulting in variable syptoms including insensivity to pain”. Today it says “rare”.
We saved snapshots of this article over twenty years; you are reading the 2005 one. Red dashes: removed from Wikipedia since.Pale dots: rewritten; the numbered note shows what it says now.Red text: written in or rewritten since the previous snapshot.1 tap a number or a side note to jump between them
The opening as it read in 2005
Familial dsyautonomia , or FD , is a disorder of the autonomic nervous system resulting in variable syptoms including insensivity to pain, inability to produce tears, poor growth, and labile blood pressure. People with FD have frequent vomiting, pneumonia, problems with speech and movement, and difficulty swallowing.1
This is Wikipedia's own text, saved in our repository. Their copy of it is revision 16963222.
The opening as it stood in 2010
Medical condition Familial dysautonomia ( FD , 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 FD 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.Originally reported by Riley, et al. in 1949, FD 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.PMID 18118947 . : CS1 maint: multiple names: authors list ( link ) Axelrod FB (2002).Familial dysautonomia and other HSANs".
Red text was written in or rewritten since the previous snapshot. Their copy is revision 369588544.
The opening as it stood in 2015
Medical condition Familial dysautonomia (FD), sometimes called Riley–Day syndrome and hereditary sensory and autonomic neuropathy type III (HSAN-III) — 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 FD 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. Originally reported by Conrad Milton Riley and Richard Lawrence Day in 1949, FD 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. PMID 18118947 . : CS1 maint: multiple names: authors list ( link ) Axelrod FB (2002). Familial dysautonomia and other HSANs".
Red text was written in or rewritten since the previous snapshot. Their copy is revision 629680076.
The opening as it stood in 2020 1 passage from the previous snapshot no longer appear
Medical condition Familial dysautonomia ( FD ) is a rare, progressive , recessive genetic disorder of the autonomic nervous system seen primarily in people of Eastern European Jewish descent that affects the development and survival of sensory , sympathetic and some parasympathetic neurons in the autonomic and sensory nervous system . FD results in variable symptoms, including insensitivity to pain , inability to produce tears, poor growth and labile blood pressure (episodic hypertension and postural hypotension). People with FD 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 . Originally reported by Drs.Conrad Milton Riley (1913–2005) and Richard Lawrence Day (1905–1989) in 1949, FD 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. Familial dysautonomia and other HSANs".
Red text was written in or rewritten since the previous snapshot. Their copy is revision 960130795.
The opening as it stood on October 6, 2023
Medical condition Familial dysautonomia ( FD ), also known as Riley-Day syndrome , is a rare, progressive , recessive genetic disorder of the autonomic nervous system that affects the development and survival of sensory , sympathetic , and some parasympathetic neurons in the autonomic and sensory nervous system . FD results in variable symptoms, including insensitivity to pain , inability to produce tears, poor growth, and labile blood pressure (episodic hypertension and postural hypotension). People with FD have frequent vomiting crises, pneumonia , problems with speech and movement, difficulty swallowing , and inappropriate perception of heat, pain and taste, as well as unstable blood pressure and gastrointestinal dysmotility . Originally reported by Drs. Conrad Milton Riley and Richard Lawrence Day in 1949, FD is one example of a group of disorders known as hereditary sensory and autonomic neuropathies ( HSANs ). All HSANs are characterized by widespread sensory dysfunction and variable autonomic dysfunction caused by incomplete development of sensory and autonomic neurons. Familial dysautonomia and other HSANs".
Red text was written in or rewritten since the previous snapshot. Their copy is revision 1172151328.
The opening as it stood in 2025
Medical condition Familial dysautonomia ( FD ), also known as Riley–Day syndrome , is a rare, progressive , recessive genetic disorder of the autonomic nervous system that affects the development and survival of sensory , sympathetic , and some parasympathetic neurons in the autonomic and sensory nervous system . FD results in variable symptoms, including insensitivity to pain , inability to produce tears, poor growth, and labile blood pressure (episodic hypertension and postural hypotension). People with FD have frequent vomiting crises, pneumonia , problems with speech and movement, difficulty swallowing , and inappropriate perception of heat, pain, and taste, as well as unstable blood pressure and gastrointestinal dysmotility . Originally reported by Drs. Conrad Milton Riley and Richard Lawrence Day in 1949, FD is one example of a group of disorders known as hereditary sensory and autonomic neuropathies ( HSANs ). All HSANs are characterized by widespread sensory dysfunction and variable autonomic dysfunction caused by incomplete development of sensory and autonomic neurons. Familial dysautonomia and other HSANs".
Red text was written in or rewritten since the previous snapshot. Their copy is revision 1292063939. This is our newest snapshot; the live article may have moved again since.
Today
In 2005 Wikipedia's first sentence called it “disorder of the autonomic nervous system resulting in variable syptoms including insensivity to pain”. Today it says “rare”. Read the current article and compare.
2005
2010
2015
2020
Oct '23
2025
Counts in the opening at each snapshot. Green: the word gained ground. Red: it was cut. Grey: no change.
What Wikipedia says this is
Every article opens by defining its subject. This one was redefined between 2005 and 2025.
Then
disorder of the autonomic nervous system resulting in variable syptoms including insensivity to pain
Now
rare
Struck red text is no longer in the article; dotted amber text was rewritten. Every revision id links to Wikipedia's copy; the text shown is our own saved copy. Data: /data. Wikipedia text is CC BY-SA; quoted for the record; not affiliated with Wikipedia.
