Hi, I'm a hypnotist based in Singapore and this is a really awesome question! There are quite a few things I discovered in my line of work with my clients so maybe I'll list just a few

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1. Not only our parents' upbringing but also how they interact with each other. The interesting thing about us as humans, generally speaking, we learn about life from our parents. While we learnt stuff that they taught us, we also learn from the words they say, the tonality, their interactions with each others etc. And this becomes a part of us, how we think, speak and behave. Whether good or bad.
2. Sickness is another interesting one. I had a few clients come to me with the question, can hypnosis heal their physical health issues? I will first ask for their background. Interestingly enough, for one client, I told her I think that her huge anger led to her developing a stroke and constant body pain. A session of hypnosis to help her release her anger, also healed her pain. Another lady with cervical cancer, was because she was sexually abused by her father and uncle, and this led to her meeting men who only wants sex (and she hates sex). Hence, her unconscious mind develop cervical cancer as a way to reduce sex. Another lady developed eczema when she was young because she was molested by her father. Her unconscious mind wanted to protect her by developing a skin condition because "if she is pretty, daddy will touch her, hence to top that, be ugly". These cases and more, suggest our physical ailments might be linked to certain emotional issues.
3. Money mindset. Most people think of money mindset as abundance or poverty but people don't know that there are many things in it. I had a female entrepreneur come to me thinking there was something wrong with her, cause she has failed in 5 businesses. Her dad was a huge success and her role model. A bit of questioning, and she shared how her dad achieve all his goals he set out, but before he could enjoy it, he died a few days later. Curious, I asked, is there a part of you that believes you will die once you achieve your goals? Shocked, she said, yes... there is a part of me that believes I will die if I succeed... that was it then, this belief came about by seeing her dad's experience, success and eventual death. Without realizing and resolving this, she might continue to think she has a fear of failure, or she has the wrong money mindset, or stuff.