Which are the causes of Trichotillomania?

Stress, life changes.

•Stress
•some people say it's hereditary
•past experiences
•trama

Some people link trich to anxiety, stress or dealing with past trauma. While this is true for some, it is not for all. Others have no idea what started it - I have random memories of being 2 or 3 and pulling hair out to line up along a pattern on the carpet.
For some, there could be a trigger early in life that starts them pulling their hair out. I used to have thick, long hair. When at a hairdresser at age 8ish, I was told I was so lucky my hair was so thick, because I had a mole on my head. This made me curious, so I started pulling in order to find it. This may well have got the ball rolling for me. (End note - years later, when the trich forced me to shave my head, no mole! Flipping hairdresser!!)
I've heard of others starting when told that blowing an eyelash was magic, or things to that extent.
Often trich starts in childhood, so having triggers might make sense. But there must be an underlying predisposition to pull already there. My guess would be genetics, since some have more than one case of trich in their families.

This disorder is still shrouded in mystery and the causes are unknown. Many link it to Obsessive Compulsion, while others link it to Anxiety or even Addiction.

My condition began after the dead of close family members, but each person is different and there does not seem to be one specific cause of trich.

Stress, anxiety, depression, and boredom. Could be chemicals, foods, or other outside things but not common to everyone with trich. People even pull for different reasons but anxiety and stress are accepted as reasons people pull.

unknown. There is speculation that it is a gene but no one knows for sure. Lots of research is happening now. Trichotillomania(TTM)Awareness and other Facebook groups were created to help encourage others suffering the same.

We don't actually know, but we mostly think it's an anxiety or obsessive compulsive disorder. It can be triggered by trauma, stress, or any number of things.

They are not sure yet. My guess is hormonal issues, as it is very common for trich to start in the puberty years. I also think that certain people with trich have predisposition to anxiety and depression and perfectionism. I there is also a genetic component, however that link is still being further studied. Food, vaccines, etc do not cause trich. There have been some speculation that trich might originate in the amygdala part of the brain, where your fight or flight response resides. There have been injuries to people in these areas that then bring on trich symptoms. This research is inconclusive and more is needed.

A lot of those affected suffered from early childhood trauma of some sort. For some it is a control issue, where as others it’s an obsessive issue. There is no known cause, only certain things that can lead to it.

Stress, anxiety, depression and it's genetic.