For what reason were hatters considered mad in the Victorian era?

Alice in Wonderland character
hammering the head during hat adjusting
empty hat symbols empty head
mercury poisoning
Mad hatter's disease is a common name for chronic mercury poi­son­ing among hat­mak­er­s, who were often exposed to mercury vapors during felting works. Along with physical symptoms such as tremors or loss of hair and teeth, hatters tended to develop char­ac­ter­is­tic psy­cho­log­i­cal traits, such as patho­log­i­cal shyness and marked ir­ri­tabil­i­ty.

Answers distribution

Alice in Wonderland character
hammering the head during hat adjusting
empty hat symbols empty head
mercury poisoning
answers
flagUkraine
3%
3%
6%
80%
31
flagSpain
7%
3%
11%
76%
26
flagSweden
2%
8%
20%
68%
35
flagthe United States
13%
10%
9%
65%
513
flagRepublic of Ireland
8%
11%
14%
65%
81
flagItaly
10%
13%
10%
65%
38
flagCzech Republic
4%
17%
13%
65%
23
flagthe United Kingdom
11%
12%
10%
63%
410
flagFrance
8%
15%
13%
60%
45
flagCanada
12%
15%
6%
58%
63
flagthe Philippines
9%
18%
15%
57%
33
flagPoland
11%
15%
15%
56%
16032
flagGermany
10%
14%
17%
56%
212
flagthe Netherlands
16%
8%
20%
56%
50
flagAustria
12%
16%
16%
56%
25
flagDenmark
17%
13%
13%
52%
23
flagBelgium
17%
17%
13%
52%
23
flagIndia
17%
14%
17%
48%
164
flagNorway
11%
17%
20%
48%
35
flagUnknown
14%
19%
20%
45%
626

Gender

men50%
women55%
Alice in Wonderland character
15%
11%
hammering the head during hat adjusting
16%
17%
empty hat symbols empty head
17%
15%
mercury poisoning
50%
55%

Language versions

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For what reason were hatters considered mad in the Victorian era?
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