Name the impact without exaggerating it
Describe who had to wait, worry, redo work, spend money, or make a choice with incomplete information. For a message about how to report medication side effects to a clinician, use this factual base: separate symptoms, diagnoses, medication, dates, and clinician advice from assumptions or internet research.
Make repair practical
Offer the repair you can actually complete, with ownership, timing, and any limit stated honestly. Ask for the record, appointment, review, accommodation, or care decision through the correct channel. Make the immediate next step clear enough that the recipient can answer without reconstructing the entire history.
Let future behavior carry the proof
Do not share another person's medical information or treat a message as a substitute for clinical advice. Contact local emergency or urgent medical services for severe, worsening, or immediately dangerous symptoms. A promise inside a message is weaker than a visible change in what you do after it.