At a Glance
“Is this ADHD or depression and why does everything feel so hard to start?”
Low motivation, poor concentration, mental exhaustion, and difficulty getting things done can occur in both ADHD and depression. In adulthood, these experiences are often misunderstood because the two conditions can overlap in important ways.
However, the reasons behind these difficulties are not always the same. ADHD is primarily linked to differences in attention regulation and executive functioning, whereas depression is more strongly associated with persistent low mood, loss of interest, and reduced emotional energy. Understanding what may be driving these patterns can help guide more effective ADHD assessment in Petersfield and the right psychological support.
I am Dr Sonney Gullu-McPhee, a Chartered Clinical Psychologist (HCPC & BPS registered) offering ADHD assessments in Petersfield, Hampshire and online across the UK for adults aged 17 and over.
Understanding ADHD and Depression in Adults
ADHD and depression are often confused, particularly in adulthood where difficulties with energy, concentration, and day-to-day functioning can appear similar on the surface.
ADHD is a neurodevelopmental condition that affects attention regulation, executive functioning, and the ability to organise, prioritise, and follow through on tasks. These patterns are typically long-standing and are often present from childhood, even if they were not recognised at the time. A clearer understanding of adult ADHD can be a useful starting point.
Depression, by contrast, is primarily characterised by persistent low mood, reduced interest or pleasure, and a loss of emotional and physical energy. It may develop at different stages of life and is often influenced by life experiences, stress, burnout, or emotional factors. Depression therapy focuses on supporting mood, emotional processing, and re-engagement with life.
I am Dr Sonney Gullu-McPhee, a Chartered Clinical Psychologist (HCPC & BPS registered) with postdoctoral training in the assessment and management of ADHD, alongside Schema Therapy, Compassion-Focused Therapy, EMDR, and other evidence-based approaches. In my work, I often see how ADHD symptoms in adults can be misunderstood, particularly when motivation, attention, emotional wellbeing, and nervous system overwhelm become affected over time.
Motivation and Task Initiation
One of the most common overlapping difficulties is struggling to begin tasks.
In ADHD, this is often linked to difficulties with task initiation and executive functioning. A person may know exactly what needs to be done and genuinely want to do it yet still feel unable to get started. This can lead to frustration, overwhelm, and harsh self-criticism, particularly when tasks appear simple or routine to others.
Adults with ADHD often describe feeling mentally “stuck,” particularly with tasks that feel repetitive, overwhelming, or insufficiently stimulating.
In depression, reduced motivation is more commonly associated with low mood, emotional heaviness, and diminished interest. Tasks may feel effortful, meaningless, or emotionally draining, making engagement difficult even when the individual recognises their importance.
Although both can result in procrastination or inactivity, the underlying internal experience is often very different.
Energy and Fatigue Patterns
Low energy is another area where ADHD and depression can overlap.
In ADHD, energy levels are often inconsistent. Individuals may feel mentally exhausted by tasks requiring sustained attention, yet experience periods of intense focus or energy when something feels stimulating, urgent, or emotionally engaging.
This pattern is commonly seen in adults with ADHD, particularly where attention regulation depends heavily on interest, novelty, urgency, or emotional activation.
In depression, low energy tends to feel more persistent and pervasive. People often describe feeling physically and emotionally drained, with even small everyday responsibilities requiring considerable effort.
This distinction between fluctuating energy and consistently depleted energy can sometimes help clarify what may be contributing to the difficulties.
Emotional Experience and Self-Perception
The emotional tone of the experience can also differ.
In ADHD, frustration and overwhelm are often prominent. Individuals may feel annoyed with themselves for struggling to stay organised, complete tasks, or manage everyday demands consistently.
Many adults with ADHD also experience emotional dysregulation, sensitivity to criticism, shame, or chronic feelings of underachievement linked to years of struggling silently.
In depression, there is usually a deeper and more sustained sense of low mood. This may include sadness, emptiness, emotional numbness, or a reduced ability to experience pleasure or meaning. Some individuals also experience hopelessness or a sense of disconnection from themselves and others.
While both experiences can involve self-criticism, the emotional depth and persistence of low mood are often more characteristic of depression.
Thought Patterns in ADHD and Depression
The nature of thoughts can provide further insight into what may be happening.
In ADHD, thoughts often centre around difficulties with organisation, follow-through, and mental activation. Individuals may think:
- “I need to do this, but I just can’t get going.”
- “Why can’t I stay on top of things?”
- “I know what I need to do, but my brain just won’t cooperate.”
In depression, thoughts are more likely to involve broader negative beliefs about the self, the future, or life in general. These may include:
- “I’m not good enough.”
- “What’s the point?”
- “Things are never going to improve.”
Although these patterns can overlap, more global feelings of hopelessness and negative self-worth are often associated with depression.
Timing and Life History
Looking at when these patterns began can be an important part of understanding them.
ADHD is usually long-standing, with difficulties often traceable back to earlier life, even if they were subtle, masked, or compensated for over time.
Many adults seeking an ADHD assessment notice that patterns of distractibility, overwhelm, disorganisation, emotional intensity, or difficulties with concentration have existed for much of their lives.
Depression may emerge later and can fluctuate depending on life circumstances, stress, burnout, loss, or emotional experiences. For some individuals, symptoms occur in episodes, while for others they may persist for longer periods.
Exploring the timeline carefully can help clarify whether the difficulties reflect a lifelong neurodevelopmental pattern, a mood-related difficulty, or a combination of both.
When ADHD and Depression Overlap
In practice, the distinction is not always straightforward. Many adults experience both ADHD and depression, and each can influence the other.
Long-standing ADHD-related difficulties, such as chronic disorganisation, missed deadlines, emotional overwhelm, or repeated experiences of perceived failure, can gradually contribute to low self-esteem, stress, burnout, and depression over time.
At the same time, depression can affect concentration, memory, mental clarity, and motivation in ways that resemble ADHD symptoms.
This overlap can make it difficult to determine what is driving the experience without a more structured and comprehensive ADHD assessment process.
Why the Right Understanding Matters
When ADHD is not recognised, individuals may continue struggling with organisation, follow-through, emotional regulation, and mental overload despite significant effort. Over time, this can contribute to frustration, shame, burnout, and self-doubt.
When depression is not addressed, low mood, emotional exhaustion, and withdrawal may continue to affect quality of life, relationships, work, and daily functioning.
A clearer understanding allows support to become more targeted, meaningful, and effective, addressing the underlying causes rather than only the visible symptoms. For some individuals, a broader psychological profile can also help bring together overlapping difficulties into a single, coherent understanding.
When to Consider an ADHD Assessment
For some individuals, it becomes important to explore these difficulties more formally.
This may be when patterns have been present for many years, when low mood does not fully explain the difficulties, or when challenges with organisation, follow-through, distractibility, emotional regulation, and task initiation feel persistent and longstanding.
A comprehensive ADHD assessment can help clarify whether ADHD, depression, anxiety, burnout, or a combination of factors may be contributing to your experience. You can read more about what to expect from the assessment process before deciding whether to take the next step.
ADHD Assessments and Psychological Support in Petersfield
In my practice, I provide comprehensive ADHD assessments in Petersfield, Hampshire for adults aged 17 and over, alongside online ADHD assessments across the UK.
These assessments involve exploring developmental history, current patterns of attention and functioning, and the role of overlapping difficulties such as depression, anxiety, trauma, stress, or burnout. The aim is to develop a thoughtful, clinically grounded understanding of what may be shaping your experience.
Alongside assessment, I also offer psychological therapy for individuals experiencing low mood, difficulties with motivation, emotional overwhelm, and challenges in everyday functioning. Therapy provides a supportive space to explore these patterns, develop practical strategies, and build a more compassionate and sustainable way of relating to yourself.
A Compassionate Perspective
Many adults describe feeling stuck, overwhelmed, or questioning why everyday life seems harder for them than it appears to be for others. It is not uncommon to assume these struggles reflect laziness, lack of discipline, or personal weakness.
In reality, these patterns are often understandable responses shaped by how the brain regulates attention, motivation, emotion, stress, and executive functioning.
Whether the underlying difficulty is ADHD, depression, or a combination of both, gaining clarity can be an important step toward a more manageable and sustainable way forward.
Book a Free 15-Minute Consultation
If you recognise aspects of your experience in this article, you may find it helpful to explore this further. I offer a free 15-minute consultation where we can briefly discuss your experiences and consider whether an ADHD assessment or therapy pathway may be appropriate. This also provides an opportunity to see whether working together would feel like a good fit.
I offer in-person ADHD assessments and therapy sessions in Petersfield, Hampshire, as well as online sessions across the UK. Get in touch to book your consultation.
Frequently Asked Questions
How do I know if I have ADHD or depression?
ADHD and depression can both affect motivation, concentration, and day-to-day functioning, but they arise from different underlying processes. ADHD is a neurodevelopmental condition typically present from earlier life, whereas depression involves persistent low mood, reduced energy, and loss of interest. A comprehensive ADHD assessment with a Clinical Psychologist in Hampshire can help clarify what may be contributing to your experience, including whether both are present.
Can you have both ADHD and depression at the same time?
Yes. Many adults experience both conditions, and they can significantly influence one another. Long-standing ADHD difficulties can contribute to stress, low self-esteem, and depression over time, while depression can affect concentration and motivation in ways that resemble ADHD symptoms. A structured ADHD assessment helps differentiate and understand both experiences more clearly.
What does an ADHD assessment in Petersfield involve?
A comprehensive ADHD assessment typically includes a detailed developmental history, structured clinical interviews, validated screening tools, and careful exploration of current functioning. It also considers overlapping difficulties such as depression, anxiety, trauma, or burnout, ensuring the formulation is accurate, thoughtful, and clinically meaningful. More questions about the assessment are answered on the FAQs page.
Do you offer online ADHD support across the UK?
Yes. Alongside in-person sessions in Petersfield, Hampshire, I offer online ADHD assessment and therapy sessions across the UK. Online sessions follow the same structured clinical process and are equally effective for many adults exploring ADHD and depression.
Should I treat depression first before exploring ADHD?
Not necessarily. Where ADHD reflects an underlying long-standing pattern, focusing only on depression may leave important difficulties unaddressed. A comprehensive ADHD assessment can help determine whether ADHD may also be contributing and whether a combined approach would be most effective.