How do you prepare a child for a hospital visit or procedure?
By telling them the truth, at the right level of detail, at the right distance in advance — and the evidence on what helps is clear and frequently ignored.
Tell them, and do not lie. Children who are surprised by a procedure, or told something would not hurt when it did, lose trust in the adult and in medical staff — which makes every subsequent appointment harder. A single lie about pain has consequences that last years.
How far ahead, by age: very young children a day or two, since a longer wait produces anxiety without helping preparation; primary age a few days to a week; older children and teenagers as much notice as they want, and they should be involved in the discussion.
What to tell them: what will happen in order; what they will feel, see, hear and smell, which matters more than the clinical explanation — sensory information reduces distress more effectively than procedural information alone; how long it will take; what they can do to help, which gives agency; that a parent will be there, if that is true; and what happens afterwards.
Language that helps. Say "some children say it feels like a scratch or a push" rather than "it won't hurt". Avoid words that carry frightening meanings — "put you to sleep" means something specific and terrible to a child who has had a pet euthanised, so "special sleep medicine so you won't feel anything, and the doctor wakes you up afterwards" is better.
What demonstrably reduces distress: distraction during the procedure — screens, bubbles, counting, conversation — which has good evidence; topical anaesthetic cream for needles, which is underused and should be asked for; a parent present and calm, since children take their cue directly; comfort objects; and letting the child choose something, however small.
Play preparation — doctor kits, books, playing it through on a toy — genuinely works for younger children, and hospital play specialists exist for exactly this.
What not to do: promise a reward for not crying, which shames a normal reaction; hold a child down where avoidable; or express your own fear in front of them.