Depression is sometimes described in purely internal terms — a disorder of brain chemistry, of thought patterns, of motivation. That framing captures something real. But it can also obscure an equally important dimension: the social context in which depression emerges and persists.

Most people who experience depression can point to something happening in their relationships or their life circumstances. A significant loss. A marriage under strain. A transition that has left them feeling unmoored. A quiet but persistent sense of disconnection from the people around them. These are not simply background details. Research suggests they are often central to the experience of depression itself — and to recovery from it.1

Interpersonal Therapy, commonly known as IPT, was developed in response to exactly this observation. Rather than focusing primarily on internal thought patterns, IPT works with the interpersonal context of a person's life: their relationships, their social roles, and the life events that have disrupted them. It is one of several evidence-based approaches explored in our broader guide to online therapy for depression.

What Is Interpersonal Therapy?

IPT was developed in the 1970s by psychiatrists Gerald Klerman and Myrna Weissman, initially as part of a research study examining the treatment of depression.2 What began as a structured research protocol gradually became one of the most widely used and thoroughly studied psychological treatments available.

The core premise of IPT is straightforward. Depression frequently arises in connection with difficulties in close relationships or significant changes to a person's social circumstances. By improving the quality of those relationships — and developing a clearer understanding of how interpersonal difficulties are affecting mood — depressive symptoms often improve as well.

IPT is typically delivered over a defined period of time, often between twelve and sixteen sessions. It is structured but collaborative. The therapist and client work together to identify which interpersonal problem area is most relevant, and then focus their work on that specific area throughout the course of therapy.

Unlike some therapeutic approaches, IPT does not attempt to explore early childhood experiences or long-standing personality patterns in depth. It is focused on the present: on what is happening now in a person's relationships, and on practical steps that might help.

The Connection Between Relationships and Mood

One of the most clinically useful insights behind IPT is that the relationship between depression and interpersonal difficulties runs in both directions.

When someone is depressed, relationships often suffer. They may withdraw from friends and family, become less communicative, or struggle to engage with the people closest to them. Irritability — a common but sometimes overlooked feature of depression — can generate conflict in relationships that were previously stable.

At the same time, difficulties in relationships can maintain and deepen depression. A person experiencing ongoing conflict with a partner may find that low mood becomes self-reinforcing. Social withdrawal reduces the opportunities for connection that might otherwise ease distress. Unresolved grief can leave someone feeling cut off from others, even when support is available.

What makes this cycle worth understanding is that it offers a point of intervention. If interpersonal difficulties help sustain depression, then improving those relationships — or developing a clearer understanding of them — can interrupt the cycle. This is the working assumption on which IPT is built.

The Four Areas IPT Focuses On

Rather than treating all interpersonal difficulties as broadly equivalent, IPT organises them into four distinct problem areas. At the start of therapy, the therapist and client identify which area is most relevant to the current episode of depression. The work then centres on that area.

Grief

IPT uses the term grief specifically to refer to the loss of a significant person through death, rather than loss more broadly. While grief is a natural human response, some people find that low mood and withdrawal persist long after the immediate period of bereavement — sometimes for years.

Someone who lost a close friend or parent some time ago may find that their depression is connected, in ways they have not fully examined, to that loss. Perhaps the grief was never fully processed. Perhaps the relationship itself was complicated, making the bereavement harder to make sense of. IPT creates space to explore what the relationship meant, what has been lost, and how to gradually reinvest in life and connections in a way that feels genuine rather than forced.

Role Transitions

Significant life changes — even ones that are chosen and anticipated — can become a source of difficulty. Starting a new job, ending a long relationship, retiring, becoming a parent, relocating to a new city: each of these involves leaving behind a familiar identity and adjusting to a new one.

Someone who has recently retired may find, somewhat to their surprise, that what they looked forward to has become disorienting. The structure, purpose, and social contact that work provided are suddenly absent. The transition itself is not a failure, but the adjustment may be harder than expected. IPT helps people acknowledge what has genuinely been lost in a transition — not just gained — while developing a clearer sense of what the new role can offer.

Role Disputes

Role disputes refer to ongoing conflict or tension with a significant person in someone's life — a partner, a family member, a close colleague. These are not casual disagreements, but persistent patterns of difficulty where the two people involved seem to have different expectations of the relationship.

A person who finds themselves repeatedly in the same argument with a partner — never reaching resolution, never quite feeling heard — may notice that the resulting frustration and helplessness is affecting their mood significantly. IPT helps people examine role disputes more carefully: what each person expects, where those expectations differ, and what realistic options might exist — whether that involves change, negotiation, or in some cases, acceptance.

Interpersonal Deficits

This fourth area applies when someone's depression is associated not with a specific event or conflict, but with a broader pattern of limited, shallow, or unsatisfying relationships. Someone may notice that they have few close connections, that relationships tend not to develop in depth, or that despite being around others they consistently feel isolated.

There may be no single cause — no loss, no dispute, no transition — but the absence of meaningful connection is itself affecting their mood. IPT in this area tends to focus on understanding the patterns that have limited relationships, and on gently developing the social skills and opportunities that might allow for richer connection over time.

What Happens in IPT Sessions

The structure of IPT follows a recognisable shape, even as the content varies between individuals.

In the early sessions, the therapist conducts what is sometimes called an interpersonal inventory — a careful review of the person's significant relationships and recent life events. The aim is to understand the social context of the depression and identify which problem area is most relevant. By the end of this phase, the therapist and client have usually agreed on a clear focus for the work ahead.

The middle phase of therapy is where most of the active work takes place. Sessions typically explore recent interpersonal events — conversations that went poorly, situations that triggered strong emotions, patterns that recur in relationships. The therapist helps the person examine these events in detail: what happened, how it felt, what they communicated, and what the other person may have understood.

A significant part of this work involves communication. IPT pays particular attention to how people express their needs and emotions in relationships. People who are depressed often find direct communication difficult — they may suppress feelings, communicate indirectly, or withdraw rather than address a difficulty openly. The therapist may help them explore what they would like to say to an important person in their life, and whether there are clearer ways to say it.

The final sessions shift toward consolidating progress and preparing for the end of therapy. The focus moves to what has changed, what the person has learned about their relationships, and how they can continue to apply those insights going forward.

How IPT Relates to Other Approaches

IPT is sometimes compared to Cognitive Behavioural Therapy, which is among the most widely studied psychological treatments for depression. The difference in emphasis can help people understand what each approach offers.

CBT tends to focus on the internal — on identifying negative thinking patterns and examining the beliefs that maintain low mood. IPT focuses more on the external social world: on relationships, communication, and life circumstances. In practice, both approaches recognise that thoughts and relationships are deeply connected. But the entry point differs. Some people find it more natural to examine their thinking; others find it more immediately meaningful to explore what is happening in their close relationships.

Both approaches have a substantial evidence base supporting their effectiveness in treating depression.3 The most suitable approach for any individual depends on the nature of their difficulties, their personal preferences, and the judgement of a qualified therapist.

Conclusion

Depression rarely exists in isolation from the people around us. The quality of our close relationships — and the disruptions that life inevitably brings to them — can profoundly affect how we feel, sometimes in ways we have not fully recognised.

Interpersonal Therapy offers a structured and focused way to examine those connections. By identifying the interpersonal difficulties most relevant to a person's depression, and working to address them directly, IPT creates the conditions in which mood can genuinely improve.

That improvement tends to come not through dramatic insight, but through gradual shifts — in how someone understands a relationship, in how they communicate a need, in how they begin to reinvest in their social world after a loss or transition.

For many people, the experience of depression is inseparable from a sense of disconnection — from others, from familiar roles, from a life that once felt more manageable. IPT works with exactly that experience, and in doing so, offers a path toward reconnection.