It is not uncommon for a nervous breakdown to occur in someone who has an underlying, undiagnosed, and untreated mental illness. Most commonly, an anxiety disorder or major depression may trigger a nervous breakdown, especially when untreated or when treatment has been neglected. These conditions, when not treated, can make it challenging for an individual to cope with stress that otherwise might not be as significant.

Anxiety disorders are the most common mental illnesses, and many people live with one without being treated. Specific anxiety disorders include generalized anxiety, social anxiety, and panic disorder. These conditions are characterized by excessive worry and feelings of anxiety that persist. Anxiety can cause a lot of distress, dysfunction, physical symptoms, and trouble thinking. Not managing anxiety and having stress can be a recipe for a nervous breakdown.

Depression is another very common mental health condition, and when left untreated could trigger a nervous breakdown. Someone with depression feels persistently sad and hopeless, is fatigued and unable to summon interest for normal activities. Like anxiety disorders, this condition can make it very difficult to function. When not treated, the struggle to cope with the low mood as well as any added stress can easily lead to a breakdown.

While the nervous breakdown can and should be treated, when it is caused by depression or anxiety, it is crucial to get an accurate diagnosis and to address the underlying condition. Ongoing treatment and self-care for anxiety or depression will help a person recover more quickly from a nervous breakdown, and it will also provide good coping strategies to help prevent one in the future.