The thesis includes three papers: paper 1 is a literature review, paper 2 is an empirical study and paper 3 is a critical reflection. Paper 1 and 2 have been prepared for submission to Clinical Psychology and Psychotherapy. Paper 1 systematically reviews the qualitative literature pertaining to individual experiences of psychotherapy for PTSD. A meta-synthesis of twelve studies was facilitated using the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) principles. The meta-synthesis aimed to explore aspects of psychotherapy for PTSD that were deemed helpful or unhelpful. The strengths and limitations of the study are considered, as are their implications for clinical practice.Paper 2 was a qualitative exploration of basic emotions and the affective phenomena of PTSD. Semi-structured interviews were conducted with ten participants and transcripts were analysed using a deductive-inductive thematic analysis. The results highlight the importance of considering a range of basic emotions in the assessment, formulation and psychotherapy relating to PTSD. The strengths and limitations of the study are considered, as are their implications for clinical practice.Paper 3 is not intended for publication and is a critical reflection of the overall study process. It evaluates the strengths and limitations of both paper 1 and paper 2 in more detail, in addition to offering a critical and reflective account of conducting the research.