What is the theme in The Noonday Demon: An Atlas of Depression by Andrew Solomon?

As the title suggests, depression is the main theme of the book. Depression is highly misunderstood by many people. It is an illness just like any other and for this reason, needs to be treated. Besides the misunderstandings surrounding the disease, a large problem is also errors in treatment. Hardly any of those suffering from depression receive proper treatment, though the number of people who suffer from the illness is rising rapidly. Solomon describes in detail his own experience with depression, including three breakdowns and how he dealt with the symptoms during each