When handling health insurance, you must tell your health status truthfully, and you can't ignore some minor illnesses, even minor illnesses that happened a long time ago. Because many diseases are interrelated, insurance companies can think that diseases that occur within the scope of insurance are caused by minor illnesses that have not been noticed or declared, and will not make health insurance claims.
In the Insurance Law, the insurance company has the right not to claim compensation because it has not told the insurance company what it should know. Usually, when underwriting, if the insurance company finds that the insured is not a "standard body", that is, there are some diseases, but it has not reached the level of direct refusal, then the most likely way is to increase the premium, reduce the insured amount, partially exclude or conditionally underwrite.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.