Not necessarily. It depends on the medical condition you have, the insurance company guidelines for acceptance, the type of life insurance policy and other relevant factors.
Some medical conditions could simply mean paying a higher premium for your life insurance policy or getting approved for a lower amount of coverage.
Other health issues may result in you being denied life insurance from a specific insurance company.
However, some insurers specialize in providing life insurance to people considered a high risk due to their age, health, lifestyle, occupation or hobbies.
In addition, there are "guaranteed approved" life insurance plans that offer guaranteed acceptance for people who meet the age requirements, and you cannot be turned down due to any health problems.