Burnout: What is it and why do I have it?

If you Google “burnout,” it’ll be hard to find a clear, consistent answer. A post on WebMD proposes that it’s a type of exhaustion resulting from being overwhelmed. A Mayo Clinic article describes it as a form of stress. An article on Psychology Today claims that burnout is mental, emotional, and physical exhaustion resulting from stress. But burnout is not yet a diagnosable medical condition or psychological disorder, so there’s a lack of clarity around what should be a common definition.