If your GP thinks you may have bipolar disorder, they'll usually refer you to a psychiatrist, a doctor who specialises in mental health problems.
If your illness puts you at risk of harming yourself, your GP will arrange an appointment immediately.
You'll be assessed by the psychiatrist at your appointment. They'll ask you a few questions to find out if you have bipolar disorder. If you do, they'll decide what treatments are most suitable.
During the assessment, you'll be asked about your symptoms and when you first experienced them.
The psychiatrist will also ask about how you feel leading up to and during an episode of mania or depression, and if you have thoughts about harming yourself.
The psychiatrist will also want to know about your medical background and family history, especially whether any of your relatives have had bipolar disorder.
If someone else in your family has the condition, the psychiatrist may want to talk to them. But they'll ask for your agreement before doing so.
If you have bipolar disorder, you'll need to visit your GP regularly for a physical health check.
If you're diagnosed with the condition, it's important to talk to your psychiatrist so you're fully involved in the decisions about your treatment and care.
But a person is sometimes not able to make an informed decision about their care or communicate their needs, especially if their symptoms become severe.
If this happens, it may be possible to draw up an advance decision. An advance decision is a set of written instructions that state what treatments and help you want (or do not want) in advance in case you cannot communicate your decisions at a later stage.
Your GP or psychiatrist can give you further help and advice.