The short answer: Yes, for many people. Bipolar disorder often affects attention, verbal memory, and executive function (planning and mental flexibility). These problems are worst during mood episodes, but they often continue at a milder level when mood is stable. They do not affect everyone, and long-term studies suggest they usually stay stable rather than getting steadily worse.

What kinds of thinking problems are linked to bipolar disorder?

People usually describe it as forgetting things, losing the thread of a conversation, or not being able to focus on reading or work. Tests used in research measure the same things in a structured way.

A 2007 meta-analysis of euthymic patients (people whose mood was stable at the time of testing) found medium-to-large differences from healthy controls in three broad areas:

  • Attention and processing speed: how fast and steadily you take in information.
  • Episodic memory: learning and recalling new information, such as a list of words.
  • Executive function: planning, switching between tasks, and solving problems.

The same review found no deficits in vocabulary or estimated premorbid IQ. So the problem is not general intelligence. It is the speed and efficiency of thinking.

A larger 2009 meta-analysis of 42 studies and 1,197 euthymic patients found the biggest gaps in verbal learning (d = 0.81) and delayed memory (d = 0.80 to 0.92). Most other measures fell in the moderate-to-large range (d = 0.5 to 0.8).

Is memory worse during mania or depression?

Yes. In that 2009 meta-analysis, patients tested during a manic, mixed, or depressed episode showed even greater problems with verbal learning. Patients tested while depressed also did worse on phonemic fluency (naming words that start with a given letter).

The symptoms of each episode explain part of this. MedlinePlus lists being easily distracted and racing thoughts in the manic phase. It lists problems concentrating, remembering, or making decisions in the depressive phase. Poor sleep is common in both.

Depression on its own can cause the same kind of fog. If you want more on that side of the picture, depression.md covers depressive symptoms in detail.

Do the problems go away when mood is stable?

Often only partly. The best single estimate comes from a 2013 individual patient data meta-analysis. Researchers pooled raw data from 31 studies and 2,876 people. After they controlled for age, IQ, and sex, euthymic patients were impaired on all 11 test measures, with effect sizes of 0.26 to 0.63.

Those effects are smaller than older estimates. The authors said leftover mood symptoms explained some of the gap, but not all of it.

The range between people is wide. A 2016 systematic review of euthymic adults found that the share with clinically relevant impairment varied a lot by domain and study. For example, it was 8.2% to 42.1% for verbal memory and 5.3% to 57.7% for executive function.

Studies that sort patients into groups find a similar pattern. A 2025 meta-analysis of 14 studies found three cognitive subgroups:

  • About 33.5% performed normally.
  • About 42.5% had moderate impairment.
  • About 23.1% had severe impairment across all domains.

So a large share of people with bipolar disorder think normally between episodes. Another large share do not.

Do bipolar medications cause memory problems?

They can contribute, but the effect is usually smaller than people fear. A 2009 meta-analysis of 12 studies looked at lithium. It found small impairments in immediate verbal learning and memory (effect size 0.24) and creativity (0.33). Delayed memory, attention, executive function, and processing speed were not significantly affected. In long-term patients, psychomotor speed was more affected (0.62). The authors concluded lithium has only a few minor negative effects on cognition. For more on the drug itself, see what to know about lithium.

Antipsychotics show a stronger link in observational data. The 2016 review found that antipsychotic use and more severe or longstanding illness were associated with greater impairment. The 2025 subgroup analysis found the severe-impairment group had more hospital admissions, more bipolar I, and more antipsychotic use.

These are associations. People with more severe illness are more likely to need antipsychotics, so the drug and the illness are hard to separate. The 2013 pooled analysis found that impairments seemed unrelated to drug treatment.

Other factors matter too. Poor sleep, alcohol or drug use, thyroid problems, and residual mood symptoms can all make concentration worse. Many of these can be treated. See bipolar disorder and sleep for more on that link. Do not stop or change a medication because of memory concerns without talking to your prescriber.

Does memory loss from bipolar disorder get worse over time?

Current evidence says usually not. A 2014 meta-analysis of longitudinal studies followed stable patients for a mean of 4.62 years. Their performance on 14 cognitive measures stayed stable. In studies that included a control group, patients and controls changed in the same way over time.

The authors noted limits: most follow-up periods were short, and medication and mood changes could not be controlled. But the data do not support the idea that thinking steadily declines with each year of illness. For the bigger picture on aging, see does bipolar disorder get worse with age.

Memory loss that keeps getting worse, gets in the way of daily tasks, or starts late in life is not typical. It needs a medical workup for other causes.

What can help with memory and concentration?

The International Society for Bipolar Disorders (ISBD) has a Targeting Cognition Task Force. Its 2018 recommendations for clinicians say they should formally screen cognition in partly or fully remitted patients whenever possible. They suggest brief tools such as the Screen for Cognitive Impairment in Psychiatry. They also advise clinicians to review the effects of medication and other conditions, refer for full neuropsychological testing when needed, and encourage patients to build cognitive reserve.

The task force was frank: there is limited evidence for treatments aimed at cognition itself.

Cognitive remediation (structured training of memory, attention, and planning skills) is the most studied option. A 2023 meta-analysis of seven trials with 586 participants found small gains in working memory (g = 0.32), planning (g = 0.30), and verbal learning (g = 0.40). But it found no effect on day-to-day functioning. The authors said the data do not yet support adding it to treatment guidelines.

A 2026 review looked only at trials that enrolled people with confirmed cognitive problems. It found mixed results: three studies reported gains and three randomized trials did not.

Your own sense of your memory may not match test results. A 2026 meta-analysis of 35 studies found only weak correlations between self-rated and tested cognition in mood disorders. That is a reason to ask for formal testing, not to dismiss your concerns.

Practical steps that are within reach:

  • Keep mood stable, since episodes bring the worst cognitive problems.
  • Protect sleep and limit alcohol and other substances.
  • Ask your clinician to review all your medicines and check for thyroid or other medical causes.
  • Use external aids such as calendars, lists, and phone reminders.

The bottom line

Bipolar disorder can cause real problems with memory, attention, and focus. They are worst during episodes and often continue in a milder form between them, though about a third of people test normally. Lithium has small effects. Long-term studies suggest the problems tend to stay stable. Treatments that target cognition directly show only modest benefit so far. If memory or concentration is affecting your work or life, ask for a cognitive screen and a medication review.

Last updated: October 2026. This article is for informational purposes only and does not constitute medical advice. Talk to your psychiatrist or prescriber before you change any medication or treatment plan.