Childhood abuse and trauma produce hormonal & gene changes that affect children into adulthood. The linked article is a wonderfully clear explanation about some current research being conducted on stress hormones. http://to.pbs.org/1s7ubUo
Many of my clients (both somatic coaching and headache) have experienced trauma and abuse, and I find that it underlies their bodily tension, mood, and mindset about their health, healing, and lives in general. I work with them to unwind their trauma through Somatic Bodywork and Coaching and specialized Somatic Trauma training that honors their experience and helps them build the boundaries, voice, and safety that were violated.