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
7%
3%
11%
76%
26
flagItaly
8%
11%
11%
68%
35
flagRepublic of Ireland
9%
8%
15%
67%
73
flagthe United States
12%
10%
10%
65%
500
flagSweden
3%
10%
21%
64%
28
flagthe United Kingdom
11%
12%
10%
63%
397
flagCzech Republic
4%
18%
13%
63%
22
flagFrance
8%
15%
13%
60%
45
flagCanada
12%
15%
6%
58%
63
flagthe Philippines
9%
18%
15%
57%
33
flagPoland
11%
15%
15%
56%
15317
flagGermany
11%
13%
18%
56%
198
flagthe Netherlands
14%
8%
20%
56%
48
flagBelgium
17%
17%
13%
52%
23
flagNorway
8%
17%
20%
50%
34
flagDenmark
18%
13%
13%
50%
22
flagIndia
17%
14%
18%
47%
153
flagAustria
15%
21%
15%
47%
19
flagUnknown
14%
19%
20%
45%
602

Gender

men50%
women55%
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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