Words were originally magic and to this day words have retained much of their ancient magical power.
Sigmund Freud Introductory Lectures on Psychoanalysis
Psychotherapy is a process of discovery for both therapist and client. It can be challenging, exciting, frightening – even funny - as they both try to better understand the circumstances and patterns that have brought the client to the point of coming for help. Some people think that the therapist is the expert, delving into special pots of knowledge, but this is not the case. In fact, the client is the expert. The therapist is there to help the client uncover answers that are already deep within.
There are many nuanced reasons to come to therapy, and it is probably reductive to offer a list of the more obvious ones, especially as the labels themselves can be reductive in their turn. "Low mood", for example, is an unsatisfactory label for a state of being that can encompass anguish.
Sometimes people need someone to think at, and sometimes people need someone to think with: when we can't manage to work things out by ourselves any more, therapy comes into its own.