Patient Education · Depression
Low mood, or depression? How to tell
Low mood is a human response to difficult days. Depression is more likely when low mood, loss of interest or both persist most of the day, nearly every day, for at least two weeks and begin to change sleep, energy, thinking or daily functioning. Duration helps, but severity, safety and the full pattern matter more than a checklist.
The Boundary
Sadness is an emotion
Depression is a pattern
Ordinary low mood usually remains connected to what happened. It can lift for parts of the day, respond to rest or support, and does not consistently take away the ability to feel interest or pleasure. Depression is different in degree and reach: it becomes persistent, spreads across situations and starts affecting how a person sleeps, eats, concentrates, moves, relates and works.
Clinicians therefore look beyond whether someone feels sad. The core symptoms are persistent low mood and loss of interest or pleasure. Other clues include fatigue, guilt or worthlessness, slowed or agitated movement, poor concentration, appetite or sleep change, hopelessness and thoughts of death. Not everyone has every symptom, and no online checklist establishes the diagnosis.
What It Can Look Like
Depression does not always
look like sadness
Some people describe emptiness, numbness, irritability or an inability to enjoy anything rather than sadness. Others first notice unexplained tiredness, headaches, body pain, digestive symptoms or that every ordinary task has become effortful. A person may keep attending work and still be depressed; outward functioning can hide how much energy survival is taking.
The two-week threshold is useful for recognising a sustained episode, but it is not a rule to wait out severe symptoms. Thoughts of suicide, inability to eat or drink, psychotic symptoms, marked agitation, or a rapid loss of functioning require prompt or emergency assessment even if the calendar says less than two weeks.
What Must Be Checked
Not every low period
is unipolar depression
Grief, burnout, adjustment difficulties, sleep disorders, alcohol or other substances, medication effects and medical conditions such as thyroid disease or anaemia can overlap with depressive symptoms. A careful assessment asks what changed, when it changed and what else is happening rather than treating a symptom score as the answer.
It is also important to screen for bipolar disorder before choosing treatment. Past periods of unusually elevated or irritable mood, much less need for sleep, increased activity or talkativeness, racing thoughts, inflated confidence or risky behaviour may change both the diagnosis and the safest treatment plan. These periods can be forgotten when the current problem is depression.
Treatment
What actually
helps
Evidence-based options include guided self-help for some milder presentations, structured psychotherapies such as behavioural activation, cognitive behavioural therapy and interpersonal psychotherapy, and antidepressant medication. The appropriate starting point depends on severity, duration, previous episodes and response, other conditions, safety, access and the person's informed preference.
Medication is not automatic, and therapy is not a test of whether someone is “strong enough” to avoid it. Some people benefit from one approach and others from a combination. Treatment should include follow-up: early review for worsening or side effects, enough time to judge response, and a plan for continuation and gradual discontinuation when appropriate.
Care With Dr. Shaurya Garg
If this article
sounds familiar
Dr. Shaurya Garg, MD Psychiatry (AIIMS New Delhi), offers structured assessment and depression care, with fees listed transparently. Consultations are available online across India and in person in New Delhi. If you are unsure how much your symptoms are affecting you, the two-minute self-check can help you reflect before booking; it is educational, not a diagnosis.
You do not have to prove that things are “bad enough” before asking for an assessment. The useful question is whether the pattern is persistent, distressing, unsafe or changing how you live.
Sources & Further Reading
· World Health Organization: Depression fact sheet
· NICE guideline NG222: Depression in adults: treatment and management
· NICE guideline CG185: Bipolar disorder: assessment and management
These sources are provided for education. They do not replace individual clinical assessment.
Common Questions
Low mood and depression,
answered simply
How long should low mood last before I seek an assessment?
Persistent low mood, loss of interest or both for around two weeks is a common threshold for assessment. Do not wait for two weeks if there are thoughts of suicide, psychotic symptoms, inability to care for basic needs or a rapid loss of functioning; those need urgent help.
Can someone function at work and still be depressed?
Yes. Some people maintain work or family responsibilities while experiencing persistent loss of pleasure, exhaustion, hopelessness or other depressive symptoms. Outward functioning does not reveal the effort involved or replace a clinical assessment.
How is depression different from grief or burnout?
They can overlap. Grief and burnout often remain linked to a loss or prolonged demand, while depression tends to become pervasive and includes a broader pattern of symptoms. Context, duration, functioning, safety and medical or bipolar features all need to be considered.
Should I see a psychiatrist or a psychologist for depression?
Either can be a reasonable starting point. A psychiatrist can assess diagnosis, physical and medication contributors, bipolar features, risk and whether medication may help. A clinical psychologist provides structured psychotherapy. Many people benefit from coordinated care.
Are antidepressants always needed for depression?
No. The choice depends on severity, persistence, previous episodes, safety, other conditions, prior response and preference. Psychotherapy may be appropriate without medication for some people, while medication or combined treatment is useful for others.