The Biopsychosocial Model is a way of understanding mental and physical health by looking at the whole person rather than focusing on one symptom or one possible cause.
For example, someone who is struggling emotionally may also be sleeping poorly, dealing with pressure at work, feeling isolated from friends, or coping with difficult experiences from the past. Looking at just one of these areas may not tell the full story.
This is where the model becomes useful. It looks at three connected areas: biological, psychological and social factors.
For parents, patients, and people considering therapy or an assessment, this approach can make mental health feel easier to understand. Instead of asking, “What is wrong with me?” It allows a more useful question: What is happening in my life, body and mind that may be contributing to how I feel?
Table of Contents
- What is the Biopsychosocial Model?
- Why was it developed?
- What are the three main factors?
- Why do the three areas need to be considered together?
- Biological factors
- Psychological factors
- Social factors
- Practical biopsychosocial examples
- The 4 Ps of formulation
- How psychologists use the model
- What happens during an assessment?
- How it can guide therapy
- What it means for parents
- Limitations of the model
- Frequently asked questions
What Is the Biopsychosocial Model?
The Biopsychosocial Model is a framework used to understand health by looking at biological, psychological and social influences together.
It was introduced by psychiatrist George Engel in 1977. Engel argued that the traditional biomedical approach, which mainly looked at disease through physical or biological causes, could sometimes miss important parts of a person’s experience.
The newer approach asked clinicians to look beyond the body alone.
In simple terms:
- Biological factors relate to the body and physical health.
- Psychological factors relate to thoughts, emotions, beliefs and behaviour.
- Social factors relate to relationships, family, work, school, culture and life circumstances.
Modern research continues to support the importance of looking at the interaction between these areas rather than treating them as completely separate.
Why Was the Biopsychosocial Model Developed?
Imagine two people who have the same medical condition. One may recover quickly, while the other struggles for much longer. Why?
The physical condition may be similar, but the rest of their lives may be very different. One person might have a supportive family, stable housing, good sleep, helpful coping skills and manageable stress.
The other might be dealing with financial pressure, isolation, poor sleep, ongoing stress, fear about their symptoms.
A purely physical explanation may not fully explain why these people have such different experiences. The model was developed to consider those differences.
The Open University describes one of its central ideas as interdependence. A change in someone’s social circumstances can affect their psychological wellbeing, while changes in psychological wellbeing can also influence behaviour and physical processes.
The Three Main Factors
Biological factors
These include things such as:
- genetics
- physical health
- medical conditions
- hormones
- sleep
- medication
- pain
- nervous-system responses
- substance use
- nutrition
- physical activity.
Biology can influence how vulnerable someone is to certain difficulties, but it is rarely the entire explanation.
Psychological factors
These include:
- thoughts
- beliefs
- emotions
- personality
- coping skills
- past learning
- previous experiences
- self-esteem
- expectations
- emotional regulation
- behaviour.
The meaning someone gives to an experience can affect how strongly it affects them.
Social factors
These may include:
- family relationships
- friendships
- school
- employment
- financial circumstances
- housing
- culture
- community
- discrimination
- caring responsibilities
- major life events.
Social factors are particularly important because mental health does not develop separately from everyday life.
Why the Three Areas Need to Be Considered Together
It can be tempting to make three separate lists and stop there. However, that misses the main point. The three areas can affect each other.
For example, someone who loses their job may experience financial stress. That social problem may lead to worry, frustration or low confidence. Those psychological effects may then affect sleep, appetite or physical energy.
Poor sleep can make emotional coping harder, which may then make job searching feel more difficult. What started as one life event has now affected several parts of the person’s wellbeing.
This interaction is one of the main reasons the model remains important in psychology and mental-health care. Contemporary research describes it as a way of understanding health problems through interacting processes across biological, psychological and social areas..
Biological Factors in the Biopsychosocial Model
Biological factors are not limited to genes or brain chemistry. They include anything related to the body that may affect wellbeing.
For example, someone experiencing low mood may also have:
- long-term pain
- hormonal changes
- poor-quality sleep
- medication side effects
- a chronic health condition.
Likewise, a child having difficulties concentrating at school may be tired, hungry, physically unwell, or struggling with another health issue. These factors do not automatically explain the person’s psychological difficulty. However, they may be part of the picture.
This is why psychologists may sometimes recommend that a person also speak with their GP when physical symptoms or health concerns need to be explored.
Psychological Factors in the Biopsychosocial Model
In biopsychosocial model psychology, psychological factors include how a person thinks, feels and responds to situations.
For example, two people may lose their jobs.
- One thinks: This is difficult, but I can start looking at my options.
- The other thinks: I have failed. Nobody will employ me again.
The event is the same, but each person’s interpretation is different.
Psychological factors might include fear of failure, perfectionism, low confidence, negative thinking, past trauma, beliefs about oneself and other people.
However, psychological factors are not the only difficulties. Strengths also matter.
A person may have:
- good problem-solving skills
- strong emotional awareness
- confidence
- flexible thinking
- useful coping strategies.
These can protect wellbeing during difficult times.
Avoidance and the anxiety cycle
Avoidance is especially important.
For example, a teenager may avoid giving a presentation because they feel anxious about speaking in front of the class.
Staying home might make them feel better for the moment, but it also means they never get the chance to see that they may have been able to cope. The next time they face a similar situation, the anxiety can feel just as strong, or even stronger.
The Australian Psychological Society’s guidance on anxiety and treatment provides further information on anxiety symptoms and evidence-based psychological support. You can also read this whole-person anxiety framework from Internal Sunshine for more context on how these different influences can fit together.
Social Factors in the Biopsychosocial Model
Social factors look at the person’s wider life. Imagine someone experiencing ongoing stress at work. The stress may not simply be about their personality or ability to cope.
They may have:
- an unrealistic workload
- conflict with a manager
- insecure employment
- financial responsibilities
- little support outside work.
Similarly, a child’s emotional difficulties cannot always be understood without knowing what is happening at home and school. Possible social factors for children include:
- bullying
- friendship problems
- parental separation
- changing schools
- academic pressure
- family stress
- social isolation.
Social circumstances can also protect mental health. Having supportive family members, friends, teachers, colleagues or community connections can make difficult periods easier to manage.
Research into the model has also highlighted the importance of wider social conditions, including socioeconomic circumstances, social exclusion and access to resources.
Biopsychosocial Model Examples
The easiest way to understand this framework is through everyday examples.
Example 1: A Child Avoiding School
Imagine an eleven-year-old child who has started refusing to go to school. It might be easy to label the behaviour as school anxiety and stop there.
A broader assessment might find:
- Biological factors: The child is sleeping poorly and often feels physically tired.
- Psychological factors: They worry about making mistakes and feel embarrassed when answering questions in class.
- Social factors: A friendship has recently ended, and another child has been making negative comments about them.
The school refusal now makes more sense. It is not one single issue. Several things may be making school feel difficult.
Example 2: An Adult Experiencing Low Mood
Consider an adult who feels exhausted, unmotivated and disconnected. Possible factors might include:
- Biological: ongoing pain and poor sleep.
- Psychological: feeling like a failure and believing that things will not improve.
- Social: relationship problems and very little contact with friends.
Therapy might therefore involve more than simply challenging negative thoughts. The person’s sleep, pain, relationships and social support may also need attention.
Example 3: A Teenager Struggling With Stress
A teenager is becoming irritable and finding it difficult to concentrate. Possible factors include:
- Biological: puberty, irregular sleep and exhaustion.
- Psychological: perfectionism and fear of disappointing others.
- Social: exams, high expectations and conflict with friends.
Again, no single factor tells the whole story.
The 4 Ps: Another Way to Understand the Person
Psychologists may also organise information using what is sometimes called the 4 Ps.
1. Predisposing factors
These are things that may have made the person more vulnerable. Examples could include:
- family history
- temperament
- early experiences
- long-term health problems.
2. Precipitating factors
These are events that may have started or increased the current difficulty. Examples include:
- loss
- conflict
- illness
- bullying
- changing schools
- work problems.
3. Perpetuating factors
These may be keeping the difficulty going. For example:
- avoiding situations
- poor sleep
- isolation
- ongoing stress
- unhelpful coping habits.
4. Protective factors
These are strengths and supports. Examples include:
- supportive relationships
- hobbies
- coping skills
- stable routines
- motivation
- access to professional support.
The 4 Ps can make an assessment more useful because it does not focus only on what is wrong. It also looks at what is helping.
How Do Psychologists Use the Biopsychosocial Model?
Psychologists can use the framework to build a clearer picture of the person sitting in front of them. This matters because two people with similar symptoms may need very different support.
For example, two teenagers may both report feeling anxious.
- One may be struggling mainly because of bullying and school stress.
- The other may have a long history of worry, poor sleep and strong fears about disappointing people.
Simply saying that both teenagers have anxiety does not tell us enough about what may help them. A broader understanding can help guide the next steps.
What Happens During a Biopsychosocial Assessment?
An assessment may include questions about several areas of life. A psychologist might ask about:
- current concerns
- when difficulties started
- physical health
- sleep
- medication
- family history
- development
- previous mental-health support
- thoughts and emotions
- coping habits
- school or work
- friendships
- relationships
- major life events
- stress
- strengths and interests.
This does not mean every area is necessarily causing a problem. The aim is to understand which factors may be relevant.
For children and teenagers, information from parents can also be important. In some situations, information from school may help build a clearer picture.
Biological and physical wellbeing
For some people, treatment planning may also include attention to:
- sleep
- physical activity
- caffeine
- general health
- medical investigation where indicated
- medication discussions with an appropriate medical professional.
Assessment Is Not the Same as Diagnosis
People sometimes assume that seeing a psychologist for an assessment means they will automatically receive a diagnosis. That is not always the case, an assessment gathers information, a diagnosis considers whether a person’s symptoms meet recognised criteria for a particular condition. A formulation, however, goes further.
It asks: Why might this person be experiencing this difficulty now, and what may be keeping it going?
This can be particularly useful in therapy because treatment needs to make sense for the individual.
How Can the Model Guide Therapy?
A biopsychosocial approach does not mean that everyone needs several different treatments. It means support can be based on the areas that actually matter for that person.
For example, therapy might focus on:
- coping with difficult thoughts
- building confidence
- reducing avoidance
- managing emotions
- improving routines
- communicating with family
- dealing with school stress
- strengthening relationships.
Sometimes physical health also needs attention. A person may be encouraged to speak with a GP about symptoms, medication, sleep or another health concern.
In other cases, change in the person’s environment may be important. A child may need additional support at school. An adult may need changes around work or more social support. The model therefore encourages clinicians to treat the person rather than only the symptom.
Research reviewing the model has similarly argued that psychological, social and biological treatment effects can all have a place within a broader understanding of health.
What Does This Mean for Parents?
Parents often want a clear answer when their child is struggling.
They may ask:
- Is this anxiety?
- Is something happening at school?
- Have we done something wrong?
- Why has their behaviour changed?
Those questions are understandable, but sometimes there is no single answer.
Instead, it can help to look for patterns.
Think about:
- when the problem started
- what has recently changed
- sleep
- physical complaints
- school
- friendships
- family stress
- situations the child avoids
- what helps them feel calmer
- what they enjoy and do well.
Looking at the whole child can often provide more useful information than focusing only on one behaviour.
Are There Limitations to the Biopsychosocial Model?
The model is useful, but it is not perfect. One criticism is that it can become too broad.
Almost anything could potentially be placed into biological, psychological or social categories. If clinicians simply create three long lists without deciding which factors actually matter, the model may not add much value.
Academic discussion has therefore stressed the importance of understanding how factors interact, rather than simply naming them.
For patients and families, the practical lesson is simple: The aim is not to examine every possible detail of a person’s life. The aim is to identify the factors that appear most relevant to what they are experiencing.
Frequently Asked Questions
1. What are the three factors in the biopsychosocial model?
The three areas are biological, psychological and social factors. Biological factors involve the body, psychological factors involve thoughts, emotions and behaviour, and social factors involve relationships, environment and life circumstances.
2. How is the model used in therapy?
It can help psychologists understand what factors may be contributing to a person’s difficulties and decide which areas may be useful to address during treatment.
3. Is the biopsychosocial model only used for mental health?
No. It has been used across both physical and mental healthcare because health problems can involve interactions between physical, psychological and social factors.
4. What is a biopsychosocial assessment?
It is an assessment that considers several areas of a person’s life, including physical health, mental wellbeing, behaviour, relationships and social circumstances.
5. Does a biopsychosocial assessment always lead to treatment?
Not necessarily. An assessment is mainly used to understand what may be contributing to a person’s difficulties. The findings can then help decide whether therapy, practical support, medical input or another type of care may be useful.
6. What is the difference between the biomedical and biopsychosocial models?
The biomedical model mainly focuses on biological causes of illness. The biopsychosocial approach takes a wider view by considering biological, psychological and social influences together.
Looking at the Whole Person
The Biopsychosocial Model reminds us that mental health is rarely as simple as one symptom having one cause. A person’s physical wellbeing can affect their mood. Their thoughts can affect their behaviour. Relationships, school, work and stressful experiences can affect both.
Most importantly, these influences can change over time. For parents, this approach can help make sense of behaviour that may otherwise feel confusing. For adults, it can explain why simply “thinking positively” or addressing one problem may not always be enough.
For therapists and psychologists, it provides a starting point for understanding the person behind the symptoms. At Internal Sunshine, psychological support and assessments consider the individual as a whole. If you are concerned about yourself, your child or someone in your family, understanding what is contributing to the difficulty can be an important first step.
Visit Internal Sunshine to learn more about therapy, assessments and available psychological support.