It depends. First of all, what health insurance did you buy? If you buy one-year medical insurance, the contract does not guarantee renewal, and the insurance company can cancel the contract without renewal. Secondly, if you bought critical illness insurance, but you didn't get health information when you insured it, now the insurance company has the right to terminate the contract within two years after learning about the previous illness. . So you must be in good health when you buy insurance. If not, you must also inform yourself of your previous illness, otherwise the dispute will be very troublesome.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.