How to Recognise the Early Signs of Depression: A Doctor’s Guide to Spotting Low Mood
By Dr Daniel Gordon • 20, May 2025
One of the commonest challenges I encounter in my clinic is helping people recognise they might be struggling with low mood or depression. Often, they don’t come in until their symptoms have already caused months or even years of distress—by then, their work performance, social life, and even physical health may be suffering. In many cases, stigma or shame can delay someone’s first visit to a healthcare professional, but there is another factor at play as well: a genuine difficulty in spotting the subtle shifts that indicate depression.
This article explores how depression can creep up so gradually that it’s hard to notice, especially for those who’ve always considered themselves to be “worriers” or “negative thinkers.” We’ll look at how you can use self-screening questions and mood-tracking strategies to catch the early signs of depression, so you can seek help sooner and potentially avoid more severe mental health struggles later.
1. Why It’s Hard to Spot Depression in Yourself
A Gradual Onset
Unlike acute health issues—think of appendicitis, where severe pain flares up abruptly—depression usually emerges slowly. Day by day, you might feel a bit more tired, a bit more pessimistic, or a bit less motivated, but nothing so dramatic that you immediately think: “I need help.” You may attribute these feelings to normal stress, everyday annoyances, or personality quirks.
Influences on Self-Perception
Depression doesn’t just alter your emotions. It also affects how you interpret and judge your own thoughts and behaviours. If you’ve always been prone to negative thinking, you might pass off new or worsening symptoms as “just another bad day,” rather than questioning whether this negativity could be a symptom of clinical depression. This slow, creeping change is one reason so many people fail to recognise when low mood starts to descend into something more serious.
2. The Role of Stigma vs. True Unawareness
It’s true that stigma and shame can prevent people from seeking help. Feeling embarrassed or worried about being judged can lead them to hide their struggles from friends, family, and doctors. However, there’s also a less obvious barrier: genuine unawareness that something is wrong. When you’ve spent months—or even years—convincing yourself that persistent low mood is just part of who you are, depression can feel “normal.”
Internal Narrative: People might think, “I’ve always been a bit sad,” or “I’m just the anxious type.”
Missed Red Flags: With such thinking, new or intensifying symptoms often go unnoticed, causing substantial damage before the individual realises help is needed.
3. Subtle Shifts and Personality Traits
A Comparison with Physical Illness
To illustrate how subtle mental health changes can be, compare depression to a more acute condition like appendicitis. With appendicitis, a sudden stabbing pain in your abdomen signals an immediate red flag. You haven’t felt that pain before, so it’s obviously abnormal. With depression, though, the difference between a mild negative mood and clinical depression might not be so glaring, especially if low-level sadness or anxiety has been a lifelong companion.
Negative Thinking Patterns
If you’re naturally prone to self-criticism or pessimistic thoughts, the line between typical worry and unhealthy rumination is blurred. You may chalk up newly heightened anxiety or deeper despondency to your “baseline personality,” failing to recognise it as an actual decline in your mental health. This is where objective measures and outside perspectives become especially valuable, as they can help distinguish an ingrained personality trait from a developing mental health condition.
4. Self-Screening: Two Key Questions
One tip I frequently share with patients involves a quick self-assessment. Ask yourself two questions, focusing on the past month:
Have I felt bothered by feeling down, depressed, or hopeless?
Have I been bothered by having little interest or pleasure in doing things?
If you answer “yes” to either one, it doesn’t confirm you have depression—only a qualified healthcare professional can make that diagnosis. However, these questions are used in many clinical contexts as initial screening tools. They can alert you that your low mood isn’t just an off day or mood swing, but potentially something requiring closer attention.
(by the way, these questions are clinically valid screening questions for depression: The kind of questions you will get asked if you go to your doctor complaining of low mood)
5. Biological Symptoms: When It’s More Than a Bad Day
Another key aspect of depression is that it often affects the body, not just the mind. While not everyone with depression experiences physical changes, common biological signs include:
Sleep Disturbances: Trouble falling asleep, frequent waking in the night, or oversleeping.
Appetite Changes: Eating too much or too little, sometimes leading to noticeable weight changes.
Energy and Fatigue: Persistent tiredness not alleviated by rest or sleep.
Concentration and Memory Issues: Finding it harder to stay focused or recall information.
Physical Restlessness or Slowness: This can manifest as an inability to sit still or moving and speaking more slowly than usual.
If you notice one or more of these biological symptoms persisting for weeks or months, you should treat them as a potential warning sign.
6. Serious Warning Signs
Perhaps the clearest indication that you need help is recurring thoughts of death or feelings of worthlessness, including suicidal ideation. Even fleeting thoughts like “Life isn’t worth living” are never normal. If you experience any level of suicidal thinking, it’s crucial to seek help immediately—whether that’s contacting a mental health hotline, speaking to a GP, or confiding in a trusted friend or family member.
7. The Power of Mood Tracking
Why Track Your Mood?
Because depression can creep in so gradually, a written or digital record of how you feel day to day can make subtle changes more visible. This technique is sometimes referred to as mood tracking. Whether you use a notebook, an app, or a simple calendar, regularly rating your mood (e.g., on a scale of 1–10) can highlight negative trends over time.
How to Track
Write a Daily Note: Keep it brief, focusing on one or two sentences about your day’s emotional tone.
Use Technology: There are apps designed specifically for mood tracking. Some even allow you to log triggers and coping strategies.
Review Patterns: Look back weekly or monthly to see if your average rating is dropping or if you’re experiencing the physical symptoms discussed earlier.
Mood tracking can help you acknowledge that you’ve been feeling lower than usual for an extended period, rather than simply dismissing “bad days” as random occurrences.
8. Early Intervention Matters
Avoiding Crisis
One reason many people only realise they have depression after months or years is because they wait until a crisis. They might lose a job, see a relationship collapse, or get confronted by concerned loved ones. By that point, their depression is more entrenched, making recovery slower and more challenging.
Potential for Faster Recovery
If you catch depression earlier—when it’s still relatively mild—treatment approaches like counselling or lifestyle adjustments (e.g., improved sleep habits, exercise, and social support) may be enough to reverse the downward trend. Early intervention can also lessen the chance of needing more intensive interventions, such as higher doses of medication or admission to hospital.
9. When to Seek Professional Help
If self-screening questions, biological symptoms, or mood tracking suggest you might be depressed, it’s time to reach out for professional advice. Options include:
General Practitioner (GP): Your GP can perform an initial assessment and refer you to mental health specialists if needed.
Therapist or Counsellor: A mental health professional can offer structured talk therapy (e.g., Cognitive Behavioural Therapy) tailored to your symptoms.
Community Support: In many areas, free or low-cost mental health resources are provided by charities, community centres, or local authorities.
Remember, waiting doesn’t help when it comes to mental health. The sooner you act, the better your chances of turning things around with minimal disruption to your life.
10. Final Thoughts
Depression is often a slow, subtle progression rather than a sudden event. That fact alone makes it easy to miss, especially if you’ve always considered yourself an anxious or pessimistic person. By regularly asking targeted questions, tracking your mood, and staying alert to physical and behavioural changes, you can spot early warning signs before the condition worsens.
Key Takeaways:
Depression Rarely Arrives Overnight: Small, incremental changes in mood can become profound over time if left unaddressed.
Stigma Isn’t the Only Barrier: A genuine lack of awareness can delay professional help.
Screening Questions and Mood Tracking: Simple, effective methods to detect a downward trend.
Biological Clues Matter: Changes in sleep, appetite, and energy levels often reveal deeper issues.
Early Intervention is Crucial: Acting quickly can prevent more intensive treatments down the line.
If anything in this article resonates with you, or if you’re concerned about a potential change in your mental health, don’t wait to reach out. A conversation with a GP or mental health specialist can make all the difference. Support lines and professional services exist to ensure that no one has to face depression alone.
Disclaimer
This blog post provides general information only. It is not intended to provide instruction and you should not rely on this information to determine a diagnosis, prognosis or course of treatment. It should not be used in place of a professional consultation with a doctor.
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