Understanding Depression: Causes, Symptoms, Tests and Treatment
A person with depression may still attend college, cook dinner, go to work, smile at relatives, and answer “I’m fine” when asked. That is one reason it is often missed. It does not always look like crying all day. It can look like exhaustion, irritability, body pain, poor sleep, loss of interest, or a quiet withdrawal from daily life.
In India, conversations about mental health are improving, but many people still delay care because of stigma, fear of being judged, cost, or the belief that they should “just be strong”. Medical bodies such as the World Health Organization and the Indian Psychiatric Society recognise depression as a common and treatable health condition, not a character weakness.
This guide explains the causes, symptoms, tests, and treatment choices in plain language, with an Indian context.
What depression means
Depression is more than just low mood after a bad day. Doctors usually consider it when low mood, loss of interest or pleasure, and reduced energy lasts for at least two weeks and affects daily life.
It can affect:
Sleep and appetite
Sexual health
Energy and concentration
Work, studies, and household responsibilities
Relationships and social life
Self-worth and hope for the future
Physical health, including pain and fatigue
Some people have a single episode. Others have repeated episodes over years. Symptoms can be mild, moderate, or severe. In severe cases, a person may have thoughts of self-harm or suicide, which needs urgent help.
Why depression happens
There is rarely one single cause. Most cases arise from a mix of biological, psychological, and social factors. This is called the biopsychosocial model, a widely used medical way of understanding mental health.
Biological factors
The brain, hormones, genes, sleep, and body health all matter.
Brain chemicals and circuits
Research suggests that mood is linked to brain chemicals such as serotonin, noradrenaline, and dopamine. These chemicals help regulate sleep, motivation, reward, and emotional balance. Older explanations focused only on a “chemical imbalance”. Current research is more careful and nuanced. Depression also involves changes in brain networks that process stress, memory, attention, and reward.
Family history
A family history of depression, bipolar disorder, alcohol dependence, or suicide can increase risk. This does not mean a person will definitely develop it. It only means vulnerability may be higher, especially when life stress is also present.
Hormonal changes
Depression can appear or worsen during major hormonal shifts. Examples include:
After childbirth
Around menopause
With thyroid problems
During long-term steroid treatment
In some people with diabetes or chronic illness
Postpartum depression deserves special mention in India, where new mothers may feel pressure to look happy while handling sleep loss, feeding difficulties, family expectations, and physical recovery.
Inflammation and chronic disease
Studies link depression with chronic conditions such as diabetes, heart disease, cancer, chronic pain, and long-term kidney disease. The relationship goes both ways. A long illness can increase emotional strain, and depression can make it harder to take medicines, attend follow-ups, eat well, or stay active.
Substance use
Alcohol, cannabis, sedatives, and some other substances can worsen mood, sleep, and impulse control. In some cases, a person may drink to cope with sadness, but alcohol often deepens depression over time.
Psychological factors
The mind learns patterns from experience. Some patterns protect us. Others make stress harder to handle.
Common psychological contributors include:
Harsh self-criticism
Long-standing low self-esteem
Perfectionism
Difficulty expressing anger or sadness
Unresolved grief
Childhood neglect, abuse, or bullying
Repeated failure experiences, such as exam setbacks or job loss
Feeling trapped in a situation with no control
For example, a student preparing for competitive exams may begin with stress, then poor sleep, then shame over low marks, then isolation, then loss of motivation. The problem may be labelled as laziness, when it may actually be depression.
Social factors in India
Social conditions can strongly shape mental health. In India, these may include:
Financial debt or job insecurity
Farmer distress and climate-related crop losses
Academic pressure and entrance exam stress
Migration for work or studies
Loneliness in cities
Domestic violence or emotional abuse
Caste-based discrimination or social exclusion
Pressure around marriage, fertility, sexuality, or gender roles
Caregiving stress for elderly parents or ill family members
Limited access to mental health services in smaller towns and rural areas
Stigma remains a major barrier. Many people first visit a general physician for headache, body pain, weakness, acidity, or sleep problems. The emotional symptoms may emerge only after gentle questioning.
Clinical features and everyday impact
Depression can affect anyone. The signs are not the same for everyone.
Emotional symptoms
A person may feel:
Sad, empty, numb, or tearful
Irritable or angry over small things
Hopeless about the future
Guilty or worthless
Unable to enjoy things that once felt meaningful
In many Indian families, irritability may be more visible than sadness. A parent may snap at children. A teenager may become quiet or angry. An older adult may complain of being a burden.
Thinking and concentration
Common thinking changes include:
Poor concentration
Slow decision-making
Forgetfulness
Negative thoughts that repeat
Excessive guilt
Thoughts such as “nothing will improve” or “my family is better off without me”
Any thought of self-harm should be taken seriously. It is not attention-seeking. It is a sign that the person needs help quickly.
Physical symptoms
Depression often appears through the body, especially in primary care clinics.
Possible physical signs include:
Low energy
Sleep problems, either too little or too much
Reduced or increased appetite
Weight change
Headache
Back pain or body pain
Digestive discomfort
Reduced sexual desire
Heaviness in the limbs
These symptoms are real. They are not “imagined”. The brain and body are connected through sleep, hormones, pain pathways, and stress systems.
Changes in daily life
The impact may show up as:
Missing work or college
Falling grades
Delayed household tasks
Avoiding calls or family functions
Stopping hobbies, exercise, or social visits
Neglecting personal hygiene
Increased smoking, drinking, or screen use
Strain in marriage or family relationships
A useful clue is change from the person’s usual self. Someone who loved cricket stops watching matches. A careful worker starts making mistakes. A student who was regular begins missing classes. These changes matter.
How doctors investigate and diagnose depression
There is no single blood test or brain scan that proves depression. Diagnosis is mainly clinical, which means it comes from a careful conversation, symptom review, medical history, and sometimes rating scales.
For readers searching for how to recognize and treatment options, the first step is a proper assessment rather than guessing from one symptom.
Clinical interview
A psychiatrist may ask about:
Mood and interest level
Sleep and appetite
Energy and fatigue
Concentration
Guilt or hopelessness
Anxiety and panic symptoms
Alcohol or drug use
Medical problems and current medicines
Family history
Recent losses or stress
Thoughts of self-harm
The professional may also ask whether the person has ever had unusually high energy, reduced need for sleep, risky behaviour, or overconfidence lasting several days. This matters because bipolar disorder can look like depression at first, but its treatment is different.
Diagnostic criteria used by professionals
Doctors commonly use criteria from the Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition, Text Revision, often called DSM-5-TR, or the World Health Organization’s International Classification of Diseases, 11th Revision, called ICD-11.
In simple terms, these systems look for a cluster of symptoms such as low mood, loss of interest, fatigue, sleep change, appetite change, guilt, poor concentration, slowed movement or restlessness, and thoughts of death. Symptoms should be present most days, usually for at least two weeks, and should cause distress or difficulty in daily life.
They also help clinicians rule out other causes, such as substance use, grief reactions, bipolar disorder, thyroid disease, or medication side effects.
Screening tools
Screening questionnaires do not replace a doctor, but they help measure severity and track progress.
Common tools include:
Tool | What it helps with | How it is used |
Patient Health Questionnaire-9 | Depressive symptoms | A nine-question form used in clinics and research |
Hamilton Depression Rating Scale | Severity rating | Often used by trained clinicians |
Beck Depression Inventory | Symptom self-report | Helps understand symptom pattern |
Generalised Anxiety Disorder-7 | Anxiety symptoms | Useful because anxiety and depression often occur together |
Medical tests that may be advised
Tests are not done to “find depression” directly. They help rule out medical issues that can mimic or worsen it.
A doctor may consider:
Thyroid function test
Complete blood count to check anaemia or infection signs
Vitamin B12 or vitamin D levels when relevant
Blood sugar testing
Liver or kidney function tests before certain medicines
Pregnancy test when needed before prescribing some medicines
Sleep assessment if sleep apnoea is suspected
Testing should be guided by symptoms, age, medical history, and examination. Not everyone needs every test.
Treatment options that help
Treatment works best when it fits the person’s symptoms, risks, preferences, cost, and support system. Many people need a mix of approaches.
Medications
Antidepressant medicines can help moderate to severe depression, recurrent depression, depression with major sleep or appetite changes, and cases where therapy alone has not been enough.
Common groups include:
Selective serotonin reuptake inhibitors, medicines that affect serotonin
Serotonin and noradrenaline reuptake inhibitors, medicines that affect serotonin and noradrenaline
Other antidepressants chosen based on sleep, appetite, pain, anxiety, and side effects
These medicines usually take a few weeks to show clear benefit. Some side effects, such as nausea, loose motions, sleep change, or reduced sexual desire, may occur. A doctor can adjust the dose, change the timing, or switch medicine if needed.
A few key safety points:
Do not start or stop antidepressants without medical advice.
Do not share someone else’s prescription.
Tell the doctor about pregnancy, breastfeeding, liver disease, kidney disease, seizures, or bipolar symptoms.
Alcohol and smoking can worsen depression and interact with medicines.
Young people starting medication need close monitoring for any increase in agitation or self-harm thoughts.
Medicines are not a sign of weakness. They are one part of medical care, like using treatment for diabetes, asthma, or high blood pressure.
Psychotherapy
Therapy is not just “talking”. It uses structured methods to reduce symptoms and build coping skills.
Cognitive behaviour therapy
This therapy helps identify negative thought patterns and behaviour loops. For example, a person who thinks “I am useless” may stop trying, then feel worse, which seems to confirm the thought. Therapy helps break that cycle with practical steps.
Interpersonal therapy
This focuses on relationships, grief, role changes, and conflict. It can help when symptoms are linked to loss, marriage stress, family tension, or major life transitions.
Behavioural activation
This approach helps people restart small meaningful activities even before motivation returns. It may begin with simple tasks, such as bathing daily, walking for ten minutes, calling one trusted person, or sitting in sunlight.
Family sessions
In India, family often plays a major role in care. Family sessions can reduce blame and improve support. Helpful family responses include listening, encouraging treatment, watching for risk, and avoiding lines such as “others have bigger problems”.
Lifestyle and supportive care
Lifestyle changes do not replace treatment for moderate or severe illness, but they can support recovery.
Helpful steps include:
Regular sleep and wake times
Morning sunlight exposure
Walking, yoga, cycling, or any safe physical activity
Regular meals with enough protein
Reduced alcohol and substance use
Limiting late-night screen time
Keeping contact with relatives/friends
Breaking tasks into small steps
Exercise has consistent research support as an add-on for mild to moderate symptoms. It need not be intense. A daily walk in a park, terrace, lane, or compound can be a realistic start.
Complementary and alternative approaches
Many people in India use yoga, meditation, breathing practices, spiritual support, or community support. Some may find these calming and meaningful.
A safe approach is to use them as complementary care, NOT as a replacement for medical treatment when symptoms are severe.
A few cautions help:
Tell the doctor about herbal or Ayurvedic products, as some may interact with medicines.
Avoid stopping prescribed treatment suddenly.
Be careful with claims of guaranteed cures.
Seek urgent care if there are self-harm thoughts, hallucinations, severe agitation, or inability to eat, drink, or sleep.
Yoga and mindfulness-based practices have shown benefit in some studies as add-ons, especially for stress and anxiety symptoms. They work best when practised gently and consistently.
When to seek urgent help
Seek urgent medical help if a person:
Talks about wanting to die
Has a plan to harm themselves
Has taken an overdose or harmed themselves
Is hearing voices or seeing things others do not
Is extremely agitated, confused, or not sleeping for days
Cannot eat, drink, or care for basic needs
Is at risk because of violence, abuse, or unsafe surroundings
In an emergency, go to the nearest hospital emergency department or call local emergency services. If possible, do not leave the person alone. Remove access to medicines, pesticides, sharp objects, or other means of harm until help arrives.
Recovery is the rule, although it may be gradual
Recovery from Depression is often uneven. Some days improve before others do. Sleep may improve before energy. Appetite may return before joy. Work performance may take time. This does not mean treatment has failed.
A practical recovery plan often includes:
A clear diagnosis
A discussion of treatment choices
Regular follow-up
A safety plan if self-harm thoughts are present
Family or trusted-person support
Attention to medical conditions and substance use
Patience with small gains
Many people recover and return to meaningful work, study, relationships, and daily routines. Early care usually makes the path easier.
Disclaimer
This article is for general information only and is not a substitute for consultation with a qualified doctor, psychiatrist, psychologist, or other licensed health professional. Symptoms can have many causes, and treatment must be based on an individual assessment. If there are thoughts of self-harm, suicide, or harm to others, seek urgent medical help from the nearest emergency service or hospital.
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