They can, but often they don't. Most medical conditions do not make you inadmissible — concerns arise mainly around public health risks or conditions expected to place excessive demand on services, and exemptions exist. A police certificate is required from countries where you've lived long enough; if one is genuinely impossible to get, submit proof of your efforts and a letter of explanation rather than leaving it blank. Never hide a condition or a record — honesty is always the safer path.
Updated July 2026