How do you decide whether a disease was a pre-existing one or not?

While filling up the proposal form for insurance you need to provide details of the illnesses you have suffered during your lifetime. Such disclosures are important else at a later stage if discovered you could end up losing out terribly. At the time of insurance, you should be aware whether you have any disease and whether you are undergoing any treatment. The insurers refer such health issues to their medical panel to differentiate between pre-existing and newly contracted illnesses.
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