What I do know is that when a person is first asked to explain what is wrong, they may find it almost impossible to articulate exactly what the problem is. They may not yet have matched words to the feelings they can sense in the hidden rooms of their mind. They may still have no clear ideas about the "what", "why" or "how" relating to the origins of their difficulties. Instead of words, their angst may be expressed in behaviour which may be hard for them, or anyone else, to make sense of and can manifest itself as irritability, anger or withdrawal. Sometimes they will delay seeking help until they are in a state of crisis. It's not easy to ask; I struggled at first, too.

Perhaps my depression coincided with the start of every academic year and the subsequent increase in my workload. Or maybe there was a more biological explanation linked to the fact that I, like many people with depressed mood, find the absence of light at these latitudes intolerable in the winter months. I didn't know the answer - I still don't. This is who I am. I cope most of the time; I am well for months, sometimes even for more than a year; but there are recurring periods in my life when the world seems a darker, more hostile and unforgiving place. I am a person who gets depressed.

Yet, I believe that my experience of depression has helped me to be a more humane and understanding therapist. Psychiatrists get depressed too, more often than other doctors. Being an expert in depression doesn't confer any immunity from it and I am aware that I don't have all the answers.