Depression is diagnosed through a series of steps by healthcare professionals, starting with a conversation about your symptoms and medical history.

Step 1: Initial consultation

Diagnosis usually begins with a visit to your GP. You’ll talk about how you’ve been feeling, your symptoms, and how long you’ve had them.

Step 2: Medical history review

Your doctor will look at your past health, any current medications, and whether there’s a family history of mental health conditions. This helps identify any underlying factors.

Step 3: Physical examination

A physical check-up may be done to rule out other health problems, like thyroid issues, that can cause similar symptoms.

Step 4: Psychological evaluation

You’ll be asked about your thoughts, feelings, and behaviours. This might include questionnaires or structured interviews to help assess your mental state.

Step 5: Diagnostic criteria

Healthcare professionals use standard guidelines, such as the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) or the International Classification of Diseases (ICD-10), to make sure the diagnosis is accurate and consistent.

Step 6: Second opinion

Sometimes, a second opinion is helpful to confirm the diagnosis and make sure you get the right treatment.

What to do if you think you have depression?

If you’re worried about your mood or symptoms, speak to your GP. Early support can make a real difference.

At Rethink Mental Illness, we’re here to help you understand your mental health and find the support you need. Read more about depression here or speak to our advice team.