1) Burnout - When you've done too much work and it affects your productivity. 2) Depression - When you have a chemical imbalance or got hit by a traumatic even

1) Burnout - When you've done too much work and it affects your productivity. 2) Depression - When you have a chemical imbalance or got hit by a traumatic event that chances the way you perceive things. 3) Laziness - When you do not want to work. It could be due to any reason. You may be mindfully doing it. 4) Being in the wrong job - Actually happens to a lot more people than 1 & 2. But it could lead to 1 and 2. Maybe 3 but then you're getting paid for it. For 2) you may need to go to a doctor or therapist. Everything else you can do something about. Hope that helps!