Addiction is now widely recognized as a chronic brain disease that is influenced by genetics, environment, and mental health—not a moral failing or lack of willpower.(Source) Research suggests that genetics account for about half of a person’s risk of developing a substance use disorder.(Source) This means that growing up in a family where addiction is present can increase your risk, but it does not make addiction inevitable.

When professionals call addiction a “family disease,” they are not only talking about DNA. They are also describing how one person’s substance use affects everyone around them—emotionally, physically, and financially.(Source) Family members often experience:

• High levels of stress and anxiety
• Anger, resentment, and sometimes aggressive or defensive behavior
• Isolation, shame, and secrecy
• Physical health issues related to chronic stress and lack of self-care
• Financial strain from lost income, legal costs, or money spent on substances

Children who grow up in homes affected by addiction are at higher risk for depression, anxiety, and substance use later in life.(Source) They may also struggle with school performance, emotional regulation, and forming healthy relationships.(Source) Homes where substance use is present also have higher rates of domestic violence and other forms of family conflict.(Source)

Even relatives who do not live in the same household—such as grandparents, aunts, uncles, or adult siblings—can feel the ripple effects of a loved one’s addiction. They may worry constantly, step in to provide childcare or financial support, or feel torn between helping and protecting their own well-being.

Recognizing addiction as a family disease is not about assigning blame. It is about understanding that healing needs to involve the whole family system whenever possible. When families learn new ways to communicate, set boundaries, and support recovery, outcomes for the person in treatment and for loved ones often improve.(Source)