You generally need to show that a healthcare professional owed you a duty of care, breached the expected standard, and caused avoidable injury or loss as a result. Medical records, treatment notes, witness statements and an independent medical expert’s opinion can help establish what happened and whether the treatment fell below a reasonable standard. A poor outcome alone does not necessarily prove negligence, particularly where recognised risks were explained. A solicitor regulated by the SRA can assess the evidence, consider time limits and advise whether a claim is likely to be supportable.