The job of a teacher isn't actually different from other professions. Not really. More mental pressures, perhaps. A more rigorous workload and no time for downtime, maybe. These are just a few points which set teachers apart.
A teacher's job is difficult and includes a variety of duties. As a result, a teacher will often multi-task, a situation that sometimes prevents them from focusing on such higher-order activities as planning, engaging in professional development and reflecting on their practice, activities that would almost certainly improve their effectiveness in the long term.