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
0%
3%
6%
86%
29
flagSpain
8%
4%
13%
73%
23
flagRepublic of Ireland
10%
8%
12%
68%
70
flagItaly
9%
12%
12%
66%
33
flagSweden
3%
11%
18%
66%
27
flagthe United States
12%
10%
10%
65%
490
flagthe United Kingdom
11%
13%
10%
63%
380
flagCzech Republic
4%
18%
13%
63%
22
flagFrance
9%
16%
11%
60%
43
flagCanada
13%
15%
6%
58%
58
flagthe Philippines
10%
13%
17%
58%
29
flagPoland
11%
15%
15%
55%
14424
flagthe Netherlands
11%
9%
23%
55%
43
flagGermany
11%
14%
19%
54%
178
flagBelgium
19%
14%
14%
52%
21
flagNorway
9%
18%
21%
48%
33
flagDenmark
21%
10%
15%
47%
19
flagAustria
15%
21%
15%
47%
19
flagUnknown
14%
18%
20%
45%
550
flagIndia
18%
15%
19%
44%
137

Gender

men50%
women54%
Alice in Wonderland character
15%
11%
hammering the head during hat adjusting
16%
17%
empty hat symbols empty head
17%
16%
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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