No, a standard brain MRI cannot definitively diagnose bipolar disorder, as diagnosis relies on clinical interviews and symptom assessment, but research MRI scans can reveal subtle structural or functional differences (like changes in gray matter or connectivity) that help scientists understand the condition, rule out other issues, and potentially aid in future, more precise diagnoses. Currently, these scans are research tools, not diagnostic ones for routine clinical use, though advanced AI models show promise for distinguishing it from other conditions like depression.
Bipolar patients tend to have gray matter reductions in frontal brain regions involved in self-control (orange colors), while sensory and visual regions are normal (gray colors). (Image/Courtesy of the ENIGMA Bipolar Consortium/Derrek Hibar et al.)
To diagnose bipolar disorder, a doctor performs a physical exam, asks about your symptoms, and recommends blood testing to determine if another condition, such as hypothyroidism, is causing your symptoms. If the doctor does not find an underlying cause of your symptoms, he or she performs a psychological evaluation.
Schizophrenia: MRI can show changes in brain volume and the structure of particular brain regions like hippocampus and prefrontal cortex. Bipolar Disorder: Structural MRIs can help detect subtle abnormalities in brain regions involved in mood regulation.
Biological differences.
People with bipolar disorder appear to have physical changes in their brains. The importance of these changes is still uncertain, but more research may help identify why these changes happen.
Bipolar disorder and major depressive disorder (major depression) are two of the principal disorders among mood disorders. Although their etiology and pathophysiology have not yet been completely elucidated, a number of structural and functional neuroimaging studies suggest the importance of the frontal lobe.
Experiencing bipolar disorder can be complex and overwhelming, with emotional extremes that affect daily life. During manic phases, individuals may feel euphoric and full of energy, leading to impulsive decisions. Conversely, depressive phases can bring feelings of hopelessness, fatigue, and suicidal thoughts.
While brain scans cannot be used to diagnose bipolar disorder, they can show grey matter and amygdala activity. This information can help doctors understand how bipolar disorder affects the brain and how brain activity in those with bipolar disorder compares to those of others with a different mental health condition.
MRI brain scan T-weighted images
These images can help diagnose brain conditions such as tumors, multiple sclerosis and stroke. The machine sends radiofrequency waves into your body. The patterns of the radiofrequency waves and pulses produced by the MRI machine are called sequences.
Brain imaging techniques such as magnetic resonance imaging (MRI) are usually performed as part of a medical assessment in patients presenting with psychotic symptoms to identify potential non-psychiatric pathology, since the differentiation between primary and secondary psychosis on the basis of phenomenology alone is ...
Five key signs of bipolar disorder involve extreme mood shifts, including manic/hypomanic symptoms like inflated self-esteem, decreased need for sleep, racing thoughts, high energy/activity, and impulsive behaviors (spending/sex), alongside depressive symptoms such as persistent sadness, loss of interest, fatigue, and sleep/appetite changes, creating significant life disruption.
The mental health specialist will ask you about things like your moods, behaviour, health and family history. Bipolar disorder can take time to diagnose because it affects everyone differently and the symptoms are similar to other mental health conditions.
The first red flag of bipolar disorder often appears as significant changes in sleep patterns (insomnia or oversleeping), dramatic shifts in mood (intense irritability, euphoria, or deep sadness), and increased energy or agitation, often accompanied by racing thoughts, impulsivity (like risky spending), or severe fatigue and loss of interest during depressive phases, with these shifts differing greatly from typical mood swings and often impacting daily functioning.
MRI studies have demonstrated that people with BPD have reduced volume in the frontal lobe, bilateral hippocampus, bilateral amygdala (a reduced volume that has not always been replicated in MRI studies), left orbitofrontal cortex, right anterior cingulate cortex, and right parietal cortex and increased putamen volume.
Are all bipolar brains the same? No. While there does appear to be a link between bipolar disorders and certain structural changes in the brain, those changes can differ depending on other relevant health and lifestyle factors, such as medication use.
Changes on structural MRI are seen in all the major psychiatric illnesses (schizophrenia, bipolar disorder, depression, obsessive compulsive disorder). However, these are not specific enough to warrant the routine use of structural MRI to diagnose these disorders.
MRI and CT do not detect advanced brain damage in CTE
Surprisingly, this includes veterans who sustain mild traumatic brain injuries in IED explosions, as well as professional athletes with multiple concussions / mild traumatic brain injuries.
Brain parenchymal changes secondary to cerebrovascular disease [such as asymptomatic or silent brain infarct (SBI), age-related white matter changes, and microhemorrhages] are common incidental findings on brain MRI, and frequently seen in the elderly.
In bipolar disorder, structural brain abnormalities in the prefrontal cortex have been confirmed in postmortem studies60,61 and with structural MRI. For example, the subgenual portion of the anterior cingulate cortex was reduced in volume in patients with bipolar disorder with a family history of affective disorder.
Knowledge about the neurobiology of bipolar disorder is increasing steadily and evidence from several lines of research implicates immuno-inflammatory mechanisms in the brain and periphery in the etiopathogenesis of this illness and its comorbidities.
Symptoms of bipolar disorder
Triggers of Bipolar Disorder
Bipolar II disorder is a type of bipolar disorder in which people experience depressive episodes as well as hypomanic episodes (shifting back and forth), but never mania. People with bipolar II disorder tend to have longer and more frequent depressed episodes than people with bipolar I disorder.