The symptoms can look remarkably similar. Here is how to start telling them apart.
July 2026 · 3 min read
You are exhausted.
You cannot think straight. Your sleep is broken. Your mood is unpredictable. You may have gained weight, lost motivation, or started wondering why you no longer feel like yourself.
You have Googled your symptoms. You may even have had tests that came back "normal."
And yet nothing has changed.
What many people are not told is that several very different conditions can produce a surprisingly similar collection of symptoms. Burnout, clinical depression, perimenopause and hypothyroidism can all contribute to fatigue, brain fog, low mood, sleep disruption, changes in body composition and a sense of depletion that no amount of willpower seems to fix.
Getting the distinction right matters because the most effective path forward depends on what is driving the symptoms.
What each condition actually is
Before comparing symptoms, it helps to understand what these conditions are and what they are not.
Burnout
The World Health Organization classifies burnout as an occupational phenomenon rather than a medical diagnosis. It results from chronic workplace stress that has not been successfully managed.
The defining features are:
- energy depletion or exhaustion
- increased mental distance from work, cynicism or negativity toward work
- reduced professional efficacy
Burnout is fundamentally linked to work. Although its effects can spill into other areas of life, work-related stress remains central to the experience
Hypothyroidism
Hypothyroidism occurs when the thyroid gland does not produce enough thyroid hormone.
Because thyroid hormones influence metabolism, energy production, temperature regulation, digestion, mood and cognitive function, hypothyroidism can produce symptoms that overlap with many other conditions.
In iodine-sufficient countries, the most common cause is Hashimoto's thyroiditis, an autoimmune condition that is more common in women and often becomes apparent during midlife.
Depression
Depression is a clinical mood disorder characterised by persistent low mood, loss of interest or pleasure, and impaired functioning across multiple areas of life.
Unlike burnout, depression is not limited to work. It affects how people think, feel, function and relate to others regardless of context.
Depression is common, diagnosable and treatable.
Perimenopause
Perimenopause is the transition leading up to menopause and may begin several years before the final menstrual period.
During this time, fluctuating levels of oestrogen and progesterone can influence sleep, mood, cognition, thermoregulation and body composition. Perimenopause is a physiological life stage, not a psychological condition.
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The comparison table
Why this is so difficult to untangle
A person experiencing fatigue, cognitive slowing, weight gain, poor sleep and low mood may be entering perimenopause, developing hypothyroidism, experiencing depression, dealing with burnout or experiencing more than one of these at the same time.
This is not unusual.
RA 2019 systematic review and meta-analysis of 182 studies found a meaningful relationship between burnout and depression while concluding that the two remain distinct constructs. In other words, they overlap but are not the same thing.
Similarly, many symptoms commonly associated with perimenopause, including sleep disruption, mood changes, fatigue and cognitive complaints, also appear in hypothyroidism and depression.
The challenge is that symptoms alone rarely tell the whole story. Context matters.
When did symptoms begin?
Are they linked to workplace stress?
Do they fluctuate with hormonal changes?
Are there accompanying physical symptoms such as hot flushes, cold intolerance or menstrual changes?
The answers help guide assessment.
What to do with this
If you recognise yourself in more than one column, that is not unusual.
Three practical steps are worth considering.
1. Seek a thorough medical assessment
Symptoms such as fatigue, low mood, cognitive difficulties and weight changes can have many causes.
Assessment by your GP is important because conditions such as thyroid disease, iron deficiency, sleep disorders, nutritional deficiencies, depression and other medical conditions can present in similar ways.
2. Pay attention to context
Symptoms do not occur in isolation.
Notice whether they improve when workplace demands reduce, whether they coincide with menstrual changes, or whether they are present regardless of circumstances.
Context is often clinically useful information.
3. Be cautious of single-label explanations
Midlife health is rarely one-dimensional.
Perimenopause, burnout, sleep disruption, depression and thyroid dysfunction can coexist. Understanding the full picture often requires consideration of physiology, psychology, lifestyle, recovery and life circumstances together.
The bottom line
This is not simply a matter of motivation, discipline or trying harder.
Many symptoms commonly attributed to stress, ageing or personal failure have biological, psychological and environmental contributors that deserve proper investigation.
It is often a combination of biology, life stage and the cumulative demands of work, family, caregiving and recovery.
Understanding what is actually driving your symptoms is the first step toward finding the right support.
Susan Short is a Midlife Health and Behaviour Change Coach and founder of The Connected Thread Method. CTM integrates findings from nutritional science, behavioural psychology, sleep research and movement physiology into a structured, sequenced approach to improving health, energy and wellbeing in midlife.
If you are unsure where to start, the Health Snapshot at susanshort.com.au takes less than five minutes to complete.
A note on scope: This article is for informational purposes only and does not constitute medical advice. If you are experiencing the symptoms described above, consult your GP or a qualified health professional for assessment and diagnosis.
References
Burnout
World Health Organization. Burn-out an "occupational phenomenon": International Classification of Diseases (ICD-11), code QD85. Geneva: WHO; 2019. https://www.who.int/news/item/28-05-2019-burn-out-an-occupational-phenomenon-international-classification-of-diseases
Maslach C, Leiter MP. Understanding the burnout experience: recent research and its implications for psychiatry.
World Psychiatry. 2016;15(2):103–111. https://doi.org/10.1002/wps.20311
Koutsimani P, Montgomery A, Georganta K. The relationship between burnout, depression, and anxiety: a systematic review and meta-analysis. Frontiers in Psychology. 2019;10:284. https://doi.org/10.3389/fpsyg.2019.00284
Perimenopause & Related Mood Change
National Institute for Health and Care Excellence (NICE). Menopause: Identification and Management (NG23). Updated guideline. https://www.nice.org.uk/guidance/ng23
Australasian Menopause Society. AMS Information Sheets and Clinical Resources. https://www.menopause.org.au/health-info/fact-sheets
The Menopause Society (formerly North American Menopause Society). Menopause Symptoms.
https://menopause.org/patient-education/menopause-topics/symptoms
British Menopause Society.
Principles and Practice of Menopause Care Resource Toolkit.
https://thebms.org.uk/education/principles-practice-of-menopause-care/bms-ppmc-resources-toolkit/
Kulkarni J. Perimenopausal depression: an under-recognised entity. Australasian Psychiatry. 2018;26(1):1–4. https://pmc.ncbi.nlm.nih.gov/articles/PMC6299176/
Kulkarni J, Gavrilidis E, Hudaib AR, et al. Development and validation of a new rating scale for perimenopausal depression: the Meno-D. Translational Psychiatry. 2018;8(1):123. https://doi.org/10.1038/s41398-018-0172-0
Thyroid Function and Hypothyroidism
American Thyroid Association. Hypothyroidism (Underactive Thyroid). https://www.thyroid.org/hypothyroidism/
Endocrine Society. Endocrine Library: Thyroid Disorders. https://www.endocrine.org/patient-engagement/endocrine-library
NHS. Underactive Thyroid (Hypothyroidism). https://www.nhs.uk/conditions/underactive-thyroid-hypothyroidism/
Is It Burnout, Depression, Perimenopause, or Your Thyroid?