In FHIR, complications from therapy (e.g., "Bladder Inflammation" after "Radical Prostatectomy") should be stored as a Condition, not an Observation. Conditions represent persistent health issues, while Observations are for test results or measurements. You can link the Condition to the procedure using Condition.evidence.detail or Condition.partOf. This ensures proper tracking of therapy-related complications. Let me know if you need further clarification!