Interpersonal therapy is based on the belief that:

Interpersonal therapy (IPT) is grounded in the premise that interpersonal relationships and social functioning play a significant role in an individual's emotional well-being. The focus of IPT is on improving a person's interpersonal skills and understanding how their relationships can affect their mental health. By addressing interpersonal problems—such as disputes, role transitions, or unresolved grief—patients can enhance their emotional regulation, which contributes to alleviating symptoms of depression and other mental health issues.

The effectiveness of IPT arises from its targeted approach to resolving these specific interpersonal conflicts and improving communication skills, thus fostering a supportive social network that aids recovery. This therapeutic method acknowledges that much of a person's mental health is intertwined with their relationships and social context, which is pivotal in promoting overall psychological resilience and healing.