The term acute onset of pre-existing condition refers to an unwarned, sudden and spontaneous recurrence of a pre-existing medical condition. Some visitor insurance policies do offer coverage for acute onset of pre-existing medical conditions. The purpose of this benefit is to cover the risk that the recurrence of pre-existing medical conditions could happen. The conditions must be life threatening and the person must seek the medical care within 24 hours.
(To learn more about acute onset of pre-existing conditions, please refer to: Acute Onset of Pre Existing Conditions Explained)