Depression is fundamentally a mood disorder, characterized by its profound and often inexplicable nature. Those who experience it may find it difficult to articulate their feelings, as the pain associated with depression can be both intense and elusive. This complexity makes it challenging for those who are struggling to fully understand or convey their experiences to others.

William Styron, in his book "Darkness Visible," encapsulates this struggle with depression, emphasizing how it can overwhelm one’s mental processes. The feelings of despair can feel so overwhelming that they push the boundaries of language, making it seem almost inexpressible. Styron's insights reflect the profound inner turmoil that defines the experience of living with depression.