Is It True That Cancer Is the Leading Cause of Death in Korea? (2026 Update)

The source material provided does not include statistics showing the overall ranking of causes of death in Korea, so we cannot confirm from this material alone whether "cancer is the leading cause of death." However, the National Cancer Registry statistics do provide specific figures on 5-year survival rates and diagnosis counts by cancer type.

Key Summary

• Based on National Cancer Registry Statistics 2019–2023, the combined 5-year relative survival rate for all cancers in Korea is 73.7% (National Cancer Center Korea, Central Cancer Registry).
• By cancer type, figures vary widely: stomach cancer 78.6%, colorectal cancer 75.6%, thyroid cancer 100.2%, liver cancer 40.4%, and leukemia 55.7% (National Cancer Registry Statistics 2019–2023).
• The provided material does not include overall cause-of-death ranking statistics compiled by bodies such as Statistics Korea or the Korea Disease Control and Prevention Agency, so we cannot answer with evidence whether cancer ranks as the top cause of death.
• Survival rates are nationwide statistics, not the treatment outcomes of any particular hospital, and they are not figures that predict an individual's outcome.
• Because early-detection rates and biological characteristics differ by cancer type, it is difficult to generalize risk by lumping all cancers into a single category.

How should Korea's cancer survival statistics be interpreted?

• National Cancer Registry statistics aggregate all patients diagnosed nationwide in Korea; they are not the treatment outcomes of any specific hospital. For example, the 5-year relative survival rate for stomach cancer is 78.6%, higher than the 39.8% reported under the U.S. SEER standard. The notes accompanying the National Cancer Registry statistics explain that much of this gap stems not only from treatment technology but from how early the cancer is detected.
• Because survival rates represent the average for a group diagnosed during the same period, actual outcomes for an individual can vary significantly depending on stage, tissue type, age, and comorbidities. A single statistical figure cannot be directly translated into an individual's prognosis.

Why does the course of disease differ so much by cancer type?

• Thyroid cancer has a 5-year relative survival rate of 100.2%, meaning there is essentially no difference in survival compared to the general population of the same age group, and more than 35,000 cases were diagnosed in 2023 alone (National Cancer Registry Statistics). By contrast, liver cancer stands at 40.4% and leukemia at 55.7%, both relatively low (National Cancer Registry Statistics 2019–2023).
• These differences arise because the timing of detection, the range of treatable stages, and the biological nature of the cancer itself all differ. Therefore, rather than generalizing risk under the single category of 'cancer,' it is more accurate to look at statistics separately by cancer type.

FAQ — I heard that cancer is the most common cause of death in Korea. Is that true?

The National Cancer Registry Statistics and National Cancer Center Korea materials provided include statistics on cancer survival rates and diagnosis counts, but they do not include overall cause-of-death ranking statistics. Therefore, we cannot answer this question with reliable evidence, and for accurate cause-of-death statistics, it would be appropriate to consult separate official sources such as Statistics Korea or the Korea Disease Control and Prevention Agency.

FAQ — Does a high number of cancer diagnoses mean it is dangerous?

Not necessarily. For example, thyroid cancer had more than 35,000 diagnoses in 2023 alone (National Cancer Registry Statistics), yet its 5-year relative survival rate of 100.2% shows no difference in survival compared to the general population. A high diagnosis count may simply reflect a high rate of detection at a small size, so diagnosis counts and mortality rates should be viewed as separate matters.

Sources and Notes

This article was written based on National Cancer Registry Statistics 2019–2023 (National Cancer Center Korea, Central Cancer Registry) and statistical notes from SEER (U.S. National Cancer Institute). Direct evidence regarding the overall ranking of causes of death among Koreans was not included in the notes provided. This content is intended for general medical information purposes only; diagnostic and treatment methods, as well as outcomes, may vary depending on an individual's condition. Accurate diagnosis and treatment should always be determined through consultation with medical staff.