Usually excitement-based, when marginated neutrophils mobilize and it looks like philia, but no production is happening.
Release or administration of corticosteroids, comes from physiologic stress response (pituitary to ACTH to adrenal gland to cortisol) leads to release from bone marrow. More in blood, no tissue to go to.
Major systemic illness, metabolic disturbance (like renal failure or diabetic ketoacidosis) or pain. Hyperadrenocorticism, steriod therapy, ACTH administration