I knew someone with PTSD following a brutal rape. He choked her during the rape and she was covered in bruises, etc afterwards. For at least the next two years, she suffered from repeated bouts of bronchitis and yeast infections. She finally insisted the doctor run tests and not just give her a standing prescription for yeast meds (this was before they were available as OTC meds) and they found an infection was the root cause of the yeast infections -- something weird, like vaginal strep.

I have a serious medical condition and any time I am incredibly physically impaired, it impairs my cognitive function as well. I see no reason why we need to have brain trauma per se to make a connection between physical ailments and mental health issues.

(Edited. I fucking hate autocorrect sometimes.)