Depression symptoms: emotional and physical signs, and when to get help

Depression symptoms: what they are and the two-week rule

The core depression symptoms are a low or sad mood most of the time, or a loss of interest and pleasure in things you used to enjoy. For a doctor to call what you are going through a "depressive episode", these symptoms last most of the day, nearly every day, for at least two weeks, and come with a clear change in how you function day to day, as the World Health Organization explains. This two-week rule, together with how much the symptoms affect your life, is what separates ordinary ups and downs in mood from an illness that needs treatment.

Alongside these two core symptoms, other symptoms appear, and not everyone has all of them:

• Sadness, emptiness or emotional numbness that does not lift
• Loss of interest and pleasure, even in the things you love most
• Feeling guilty or worthless, or feeling like a burden to the people around you
• Poor concentration and trouble making even the simplest decisions
• Pessimism about the future and a sense that nothing will get better
• Irritability and impatience with people for no clear reason
• Thoughts of death or of harming yourself

Depression is more common than you might think: based on 2023 data, the World Health Organization estimates that about 5.2% of adults worldwide live with depression, that it is more common in women (6.2%) than in men (4.1%), and that around 322 million people worldwide have it. You are not a rare case, and you are not weak.

Physical symptoms of depression that people often miss

Some people reach a psychiatrist only after a long round of internal medicine, heart and digestive clinics, because the first thing they noticed was physical. Depression affects the body as well as the mood. These are its most common physical signs, as described by the UK's National Health Service (NHS) and the US National Institute of Mental Health (NIMH):

• Sleep problems: trouble falling asleep, waking very early and being unable to get back to sleep, or sleeping a lot without feeling rested
• Changes in appetite and weight: usually a decrease, sometimes an increase
• Exhaustion and low energy, with a heavy, slowed-down feeling
• Aches and pains with no clear cause: headaches, pain in different parts of the body, cramps, and digestive problems or constipation
• Moving and speaking more slowly than usual, or the opposite: restlessness and feeling on edge
• Low sex drive, which can put a strain on your marriage or relationship

If your clearest complaints are physical, that does not rule out depression, and it does not mean you are "imagining it". But a medical check-up matters, because physical conditions such as thyroid problems or low levels of certain vitamins, as well as some medicines, can cause similar symptoms, and a doctor is the one who can tell them apart.

Depression vs sadness: how to tell the difference

Sadness is a normal human feeling after a loss, stress or disappointment. It comes and goes in waves, eases with time and with people who support you, and you can still laugh and take an interest in other things. Depression is a persistent low mood that lasts two weeks or more, together with a loss of interest and pleasure, worsening sleep, appetite and concentration, and clear difficulty doing the things you normally do.

What about grief after losing someone you love?

Grieving the loss of someone you love is not an illness. The American Psychiatric Association explains the difference simply: in grief, the pain rises and falls, often alongside warm memories of the person you lost, and you usually keep your sense of your own worth. In depression, a sense of being worthless and hating yourself is common, and the low mood and loss of interest last most of the time. Grief and depression can also happen together in some people, which is why it is worth getting assessed if it goes on for a long time and brings your life to a halt.

Mild, moderate and severe depression: what each level needs

The World Health Organization classifies a depressive episode as mild, moderate or severe, depending on the number of symptoms, how intense they are and how much they affect a person's ability to get on with life:

• Mild: the symptoms are there and weigh on your day, but you still manage your work and responsibilities, with difficulty. The World Health Organization notes that antidepressants are not needed for mild depression and that psychological therapy is the first choice.
• Moderate: the symptoms disrupt a clear part of your day (work, study or home life), and here a doctor may combine psychological therapy with medication.
• Severe: near-total withdrawal, being unable to get out of bed, eat or look after yourself, and an overwhelming sense of worthlessness. It may come with suicidal thoughts or psychotic symptoms, such as hearing voices or holding beliefs that are out of touch with reality. This needs prompt help, and a psychiatrist decides on the treatment plan and how closely you need to be followed up.

The level is not a permanent verdict on you; it describes where you are now, and it changes with treatment and follow-up.

Signs of depression in young people, men and older adults

Depression does not look the same in everyone, which is why it so often goes unnoticed:

• In teenagers and young people: irritability, anger and getting frustrated easily, more than visible sadness; pulling away from friends and family; falling grades; changes in sleep and eating; and tiredness or memory problems, as NIMH explains. There is more in our article on depression in teenagers.
• In men: it may show up as anger and irritability rather than open sadness. Many men tell their doctor about physical symptoms instead of talking about their feelings, and some turn to alcohol or drugs to escape how they feel, as NIMH explains. Read more in our article on depression in men.
• In older adults: the main complaint may be emotional numbness rather than open sadness, and it often comes with physical illnesses or pain that can cause depression or make it worse. In severe cases, memory and thinking problems that look like dementia may stand out (known as pseudodementia), as NIMH explains.

If you notice these changes in someone you love, don't wait for them to ask for help. Start the conversation gently, ask how they are really doing, and listen without interrupting or blaming.

When to see a doctor about depression, and signs that need action today

The NHS advice is simple: if you have symptoms of depression for most of the day, every day, for more than two weeks, book an appointment with a doctor. And don't wait for the two weeks to pass if your life has already come to a standstill or you notice any of these signs:

• Thoughts of death or of harming yourself, or feeling that the people around you would be better off without you
• Stopping eating and drinking, or completely neglecting personal hygiene and medication
• Hearing voices or having thoughts that are out of touch with reality
• Depression after giving birth that stops a mother from looking after herself or her baby
• Drinking more alcohol or using any substance to escape your feelings
• Missing work or school for several days in a row because of how you feel

If you are worried about someone you love, ask them directly and calmly whether they are thinking about suicide. NIMH stresses that studies show asking about suicide does not increase suicidal thoughts or behavior. Stay with them, listen without blaming, help them reach a doctor, and keep means of self-harm away from them. If they are in immediate danger, do not leave them alone, and call an ambulance on 123 straight away. The World Health Organization's suicide fact sheet (2026) stresses that suicide is preventable, that more than 720,000 people die by suicide every year, and that stigma stops many people who have these thoughts from seeking help.

What happens at your first psychiatric assessment?

The fear of seeing a psychiatrist is usually bigger than the appointment itself. The first session is a structured conversation: the doctor asks about your symptoms, when they started and how they affect your day; about your sleep, appetite and concentration; about the pressures in your life; about your own and your family's health history; and about any medicines or substances you take.

The American Psychiatric Association explains that the assessment may include a physical examination and lab tests to rule out physical causes such as hormone problems, vitamin deficiencies or neurological conditions. No blood test or scan diagnoses depression on its own; tests help rule out other causes, the diagnosis is based on what you describe and what the doctor observes, and doctors are bound by medical confidentiality. As NIMH suggests, it helps to write down your symptoms and when they started before the appointment.

Depression is treatable: your next step

The good news is that depression is one of the mental health conditions that respond best to treatment: the American Psychiatric Association notes that between 70% and 90% of people with depression eventually respond to treatment.

• Psychological therapy: the World Health Organization considers it the first treatment for depression, and one of its forms is cognitive behavioral therapy (CBT). The American Psychiatric Association notes that psychotherapy can often bring clear improvement within 10 to 15 sessions.
• Medication: a doctor may decide on it for moderate and severe depression. According to NIMH, antidepressants usually take 4 to 8 weeks to work, and sleep, appetite and concentration often improve before mood does. NIMH also warns that some teenagers and young adults under 25 may have more suicidal thoughts or behavior soon after starting an antidepressant or changing the dose, so anyone taking one should be watched closely in the first weeks, and any new or worsening thoughts of suicide should be reported to the doctor straight away. Never start, stop or change a medicine your doctor prescribed on your own. If side effects worry you, read about antidepressant side effects and raise them with your doctor.
• Supportive habits: regular sleep, some light movement every day, and support from your family. They matter a lot, but on their own they do not replace treatment in moderate and severe depression.
• Other options for severe depression that does not respond to treatment, decided by a doctor after a careful assessment.

At Oxygen Center, the path begins with a psychiatric assessment at an appointment with a psychiatrist that sets out the diagnosis and how severe the depression is, followed by a plan that combines psychotherapy sessions with medication when needed, and regular follow-up until you are back to your life. If you are ready for the first step, or want to ask about someone you love, contact us at any time, day or night.