Depending on the type of policy you choose, and the insurer that you go with, you may have to undertake a medical to be successfully accepted for your life insurance policy.
This helps to give insurers a better idea of your health status, and judge your risk.
Others may just ask you for your medical history. It is important when providing insurers with information that you do so as accurately as possible, because if you are found to have misled them, then the insurance companies can refuse to pay out.