What Is Workaholism?
The term “workaholic” was coined in 1971 by the psychologist Wayne E. Oates, who referred to “an uncontrollable need to work incessantly” as an addiction. Workaholics are characterized by having an inner compulsive drive to work hard, thinking about work constantly, and feeling guilty and restless when they are not working. Workaholism often goes hand in hand with working long hours, but the two are distinct: it’s possible to work long hours without being obsessed with work, and it is possible to be obsessed with work but only work 35 hours a week or less.
Source: How Being a Workaholic Differs from Working Long Hours – Harvard Business Review – Pocket