You are here: 

Cognitive changes and chemotherapy

Some chemotherapy drugs can affect the way the brain functions, so a small number of people will notice problems with memory and concentration. Sometimes this is called “chemo-brain” or “mental fatigue.”

Causes

It is unknown exactly how chemotherapy affects the brain, so it is not clear if chemotherapy directly causes these problems. Other factors may also play a role in cognitive changes, such as:

  • dose of chemotherapy drugs (larger doses cause more severe effects)
  • antinausea drugs (may affect concentration)
  • anxiety
  • depression
  • changes in routine
  • poor nutrition

Symptoms

Changes in memory and concentration can be very subtle and mild. Some people:

  • have trouble with short-term memory, such as not remembering where they put things, what they were talking about or phone numbers
  • cannot do simple arithmetic problems
  • are easily distracted
  • tire easily when doing things that need mental energy

These effects can go away after chemotherapy is finished or may last up to a year after treatment is over. Sometimes these effects occur long after treatment is finished.

Prevention and management

The healthcare team can suggest ways to help improve concentration and manage changes in memory. Mild cognitive problems tend to respond well to rehabilitation efforts, such as cognitive retraining techniques and exercises.

To cope with changes to memory and concentration, you can try the following:

  • Plan activities that require concentration for the times of the day when you are most rested.
  • Make lists to help keep track of things, such as appointments or when to take medicines.
  • Ask a family member or friend to help you remember by listening, taking notes and asking questions at appointments.

Stories

Ray Ellis in fireman gear Because of smoke inhalation and exposure to toxic chemicals, I live with the fear of cancer virtually every day.

Read Ray's story

Volunteer for Daffodil Month

Daffodil pin

Volunteers are urgently needed in April. When you volunteer just a few hours of your time during Daffodil Month, you help save lives and support people who are living with cancer now.

Learn more