Understanding the Psychological Impact of Chronic Illness on Mental Health

Most people who receive a chronic illness diagnosis expect to manage a physical condition. What they are not prepared for is the mental and emotional weight that arrives alongside it.

Research published in PLOS One in 2025 found that depression occurs in 31% of people living with chronic illness, nearly three times the rate in the general population. 

While alarming, this statistic isn’t exactly surprising. 

Living with a chronic illness often means dealing with pain, exhaustion, and other symptoms that can make everyday life a lot harder. This can cause frustration to build up, leading to psychological conditions like depression, anxiety, and hopelessness. 

Treatment then requires more than just management of physical symptoms. It requires a holistic approach that addresses not only physical wellness but also mental and emotional health.

What Is Chronic Illness?

According to the Canadian Public Health Association (CPHA), chronic disease or chronic illness is a long-term health condition that can last indefinitely, requires ongoing medical care, and usually limits daily activities.

These illnesses are usually progressive, meaning they get worse with time, and incurable, making them the leading cause of death and disability in Canada. 

Here is a list of the most common chronic illnesses. Nearly half of the adult Canadian population lives with at least one of these:

• Cardiovascular disease
• Diabetes
• Cancer
• Arthritis and autoimmune conditions
• Chronic pain
• Respiratory illness

These chronic illnesses aren’t temporary setbacks you can recover from on a schedule. They are ongoing and reshape daily life in ways that extend far beyond the physical.

Chronic illness affects mental health in ways that are both common and clinically significant. Research published in PLOS One in 2025 found that depression occurs in 31% of people with chronic conditions, nearly three times the rate in the general population. The relationship is bidirectional: untreated mental health conditions also worsen physical illness outcomes. At Spectrum Therapeutic Solutions in Dartmouth, we work with people carrying this dual burden through individual counselling, Cognitive Behavioural Therapy (CBT), Acceptance and Commitment Therapy (ACT), and occupational therapy.

How Chronic Illness Affects Mental Health

Chronic illness not only affects the body. It also affects the mind. When your physical health deteriorates, and you don’t feel like yourself anymore, this directly impacts your mental health.

A recent 2023 psychiatric study found that among people with chronic illness, 68.7% reported stress, 51.1% reported anxiety, and 58.8% reported depression.

This study and many like it offer irrefutable evidence of how chronic illness can make depression and anxiety more likely. In fact, this two-way connection has a name. It is called a bidirectional relationship.

The study also showed that the depression rate varied significantly depending on the type of chronic illness participants were living with. 

The table below illustrates these findings:

Source: PLOS One (Abbas et al., 2025) — ncbi.nlm.nih.gov/pmc/articles/PMC12057975

The gap between 11% in the general population and 67% in cancer patients is not about changes in attitude or resilience. It clearly reflects what sustained illness does to the brain and body over time.

Ignoring mental health when living with chronic illness can:

• Make it harder to follow a treatment plan consistently
• Increase pain levels 
• Impact how the illness progresses over time

Grief and Identity Loss Stemming from Chronic Illness

Chronic illness takes things from you that do not always have names.

• The role you used to fill
• The plans you had made
• Your physical independence
• The version of yourself you expected to stay

Those losses are real, even when the people around you cannot fully see them.

There is a clinical name for this kind of loss: ambiguous loss. Coined by Dr. Pauline Boss, a professor of family social science at the University of Minnesota.

Ambiguous loss can be painful because it does not come with the social recognition that death or a clear ending carries. There is no script for grieving an illness that has not ended your life, but rather has changed it.

Many people expect grief to follow a path. Feel it, process it, reach acceptance. That model comes from Elizabeth Kubler-Ross, and it was built around death. It does not map well onto chronic illness, where the loss is ongoing, and the ending is not clear.

A more useful framework is the Dual Process Model, developed by researchers Margaret Stroebe and Henk Schut. They describe grief as something that cycles, not something that ends. You sit with the loss. You get on with living. The loss comes back. You keep going.

If that sounds familiar, you are not mishandling this. That is what this kind of grief does.

But underneath all of it, many people carry a quieter question.

Who am I now?

Dr. Jennifer Martin, a psychologist who specializes in chronic illness, describes identity reconstruction as its own process. The identity you built around your capabilities, roles, and plans does not simply update when a diagnosis arrives.

Rather, your identity fractures, and rebuilding it takes longer than most people are told to expect.

Grief vs Depression: Knowing When to Seek Help

Grief and depression can feel similar from the inside. Both are heavy. Both are exhausting. But they behave differently. 

The table below explains how.

The primary practical difference, therefore, is movement. Grief can come in waves and still leave room for moments of connection. 

Depression, on the other hand, tends to flatten more of life at once. 

If low mood, loss of interest, sleep changes, appetite changes, or feelings of worthlessness are lasting for weeks and interfering with daily life, it is worth speaking with a professional.

How Therapy Helps: Evidence-Based Approaches

One of the most effective ways to manage and understand the psychological impact of chronic illness is therapy.

Evidence-based approaches, like the ones offered at Spectrum, teach you how to carry and manage that emotional weight, rebuild daily function, and stay connected to the parts of life that still matter most to you.

These approaches include:

Cognitive Behavioural Therapy (CBT)

Chronic illness can pull thinking toward catastrophe. Symptoms feel permanent. The future feels closed.

CBT helps by:

• Identifying the thought patterns that amplify distress
• Challenging catastrophic thinking about symptoms
• Building a different relationship with the illness, rather than waiting for it to improve

The goal is not forced positivity. It is learning how to respond to difficult thoughts in a way that gives you more steadiness and less fear.

Acceptance and Commitment Therapy (ACT)

ACT is built for situations where the illness is not going away. It does not ask you to feel good about it.

Instead, ACT helps you:

• Keep doing things that matter, even when symptoms are present
• Stop putting life on hold until things improve
• Build psychological flexibility: the capacity to engage with life as it is

A 2023 meta-analysis published in Behaviour Research and Therapy found meaningful reductions in depression, anxiety, and quality-of-life impairment in people with chronic health conditions who were engaged in ACT. 

The American Psychological Association also lists ACT as having strong research support for chronic pain specifically.

Occupational Therapy

Counselling addresses how you feel. Occupational therapy addresses how you function.

Occupational therapy looks at:

• Which daily roles and routines has the illness disrupted
• What activities give your day structure and meaning
• How to rebuild function alongside emotional recovery

For many people with chronic illness, those disruptions are as painful as the actual physical pain.

Therapy and Counselling Services for Managing Chronic Illness 

At Spectrum, we have witnessed firsthand how effective therapy can be for enhancing mental health and well-being for patients living with chronic illness. 

Our individual counselling and occupational therapy services are designed not only to help patients recover and maintain their skills for daily living and working, but also to achieve a renewed sense of purpose, satisfaction, and empowerment. 

Contact us or book a free 20-minute consultation with one of our renowned therapists. We also offer in-person appointments in Dartmouth and virtual sessions across Nova Scotia.

Frequently Asked Questions

Does chronic illness cause depression?

While there is no definitive evidence that chronic illness causes depression, plenty of studies provide significant evidence that chronic illness does significantly raise the risk of depression. However, the relationship is not one-directional. 

What is the difference between grief and depression after a chronic illness diagnosis?

Grief is a normal, expected response to the losses that chronic illness brings, including loss of function, identity, independence, and plans for the future. Depression is characterized by persistent low mood, loss of interest in almost all activities, disrupted sleep and appetite, and feelings of worthlessness, lasting at least two weeks and interfering significantly with daily functioning. 

What type of therapy helps with chronic illness?

No one type of therapy works for every patient living with chronic illness. Different types of therapy, like CBT, ACT, and occupational therapy, can all be used to get meaningful results. It usually takes a customized therapeutic plan to help patients navigate the mental health challenges of living with chronic illness.

Can therapy help even if my illness won’t get better?

Yes. Therapy for chronic illness is not about curing the physical condition. It is about reducing the psychological suffering that accompanies it, rebuilding a sense of identity and purpose, and improving quality of life. People who receive psychological support alongside medical treatment report better outcomes across the board: more consistent treatment adherence, reduced pain perception, lower rates of anxiety and depression, and higher quality of life. Even when the underlying illness is unchanged.