When cancer appears repeatedly across generations, genetic factors are often suspected. Although hereditary mutations account for only 5 to 10% of all cancer cases, detecting them is a critical step for prevention and early intervention. The process typically begins with a specialized genetic consultation to review family medical history. When testing is indicated, blood or saliva samples are analyzed to identify specific mutations, such as BRCA or Lynch syndrome. It is important to note that a positive result does not guarantee cancer development, but rather identifies a predisposition that requires tailored medical monitoring. These findings are also vital for family members, as they allow those who do not carry the identified mutation to follow standard screening protocols, while providing those who do with proactive, customized health surveillance to manage their risks effectively.