A pre-existing medical condition can be any reason to cancel, interrupt or delay your trip in existence prior to purchasing insurance.  The ”look back period” varies by company and  is usually between  60 and 180 days.  Conditions treated or controlled solely through the taking of prescription drugs or medicine, and remains treated or controlled without any adjustment or change in the required prescription throughout the “look back” period  are usually not considered pre-existing.  Please refer to the policy certificate for full details of the selected plan. 

Related articles:

• I am currently taking prescription medication. Will this be considered a pre-existing condition?
• What is the "pre-existing condition look-back period"?
• If a medical condition is older than the look back period in a travel insurance policy, will it be considered as pre-existing?
• Does the pre-existing condition exclusion apply to a non traveling family member?
• Does the exclusion for a pre-existing condition apply to a family member that is not traveling with us?