My understanding is that the causes of hair pulling are not known. One thing that does seem to be the case, though, is that stress can aggravate the condition. Here are links to some articles, from PsychCentral's archives, on the subject of trichotillomania:
https://blogs.psychcentral.com/menta...chotillomania/
https://psychcentral.com/lib/an-unco...chotillomania/
https://psychcentral.com/lib/tips-th...dium=popular17
https://psychcentral.com/blog/my-lif...-hair-pulling/
 
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"I may be older but I am not wise / I'm still a child's grown-up disguise / and I never can tell you what you want to know / You will find out as you go." (from: "A Nightengale's Lullaby" - Julie Last)
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