Yes, a brain tumour can sometimes affect memory, concentration and the ability to think clearly. These changes are often described as cognitive changes, and they can vary depending on the tumour’s location, size, treatment and the individual affected.
Some people may notice small changes, such as forgetting appointments, struggling to find the right word or losing track of a conversation. Others may experience more noticeable brain tumour memory problems, including confusion, difficulty concentrating or problems remembering recent information.
At The Three Tumours, we know these changes can be frustrating for both the person affected and those around them. This guide explains why memory problems can happen, what they may feel like and where to find support.
If you are concerned about other symptoms too, our Brain Tumour Symptoms page explains the wider warning signs people may experience.
Early diagnosis matters.
Recognising Everyday Cognitive Changes
Brain tumour memory problems do not always mean forgetting major events or important people. Often, the changes are more subtle.
Someone may find themselves:
Cognitive changes include problems involving memory, concentration and clear thinking. These can include memory loss, difficulty finding words, trouble following conversations and problems focusing on one thing.
Memory depends on several areas of the brain working together. If a tumour affects one of these areas, or causes pressure or swelling nearby, it can interfere with how information is processed, stored or recalled.
The symptoms someone experiences can depend heavily on where the tumour is located. The NHS notes that brain tumour symptoms can include problems with memory and concentration, as well as changes in behaviour, speech, movement and balance.
Brain tumour treatments can also contribute to cognitive changes. Surgery, chemotherapy, some medicines and temporary swelling in the brain may all affect concentration or memory in some people. Cognitive changes can sometimes improve as swelling settles or treatment effects reduce.
The temporal lobe is especially important for memory, language and understanding sound. A tumour affecting this area may cause short-term memory loss, difficulty understanding speech or problems following written information.
This is also why brain tumour memory problems can sometimes appear alongside speech or language changes. Our guide to brain tumour speech problems explains how these symptoms can overlap.
The frontal lobe helps with planning, decision-making, attention and behaviour. A tumour affecting this area may not cause memory loss in the traditional sense, but it can make it harder to organise information, concentrate or complete familiar tasks.
Memory does not sit in one single part of the brain, so changes can also happen when connected brain networks are affected. This is one reason symptoms can vary so much from person to person.
For more information on how tumour location affects symptoms, visit our Brain Tumour Types page.
Yes, some people with a brain tumour may experience short-term memory problems.
This might mean forgetting something that happened recently, struggling to remember instructions, losing track of what someone has just said or repeatedly checking the same information.
Short-term memory problems can be particularly noticeable when someone is tired, overwhelmed or trying to process several things at once.
They may also appear alongside concentration problems, word-finding difficulties or confusion.
Confusion can sometimes occur in people affected by brain tumours, although it can have many other causes.
Someone may seem less certain about familiar tasks, struggle to follow a conversation, lose track of where they are in an activity or have difficulty processing information.
Cancer Research UK notes that brain tumour symptoms can include confusion, personality changes and difficulty thinking normally, depending on the area of the brain affected.
New or worsening confusion should always be discussed with a healthcare professional.
Yes, fatigue can make memory and concentration problems feel more noticeable.
When someone is exhausted, it can be harder to focus, take in new information or retrieve something from memory. Cancer Research UK notes that people recovering from brain tumour treatment may experience severe tiredness alongside difficulty concentrating.
If tiredness is making cognitive changes harder to manage, our Dealing With Fatigue page includes practical strategies that may help.
Other Possible Causes of Memory Changes
Not always. Memory and concentration changes can have several possible causes.
They may be linked to:
This is why it is important not to assume that every memory change has the same cause.
A clinical team can help assess what may be contributing to the problem and whether anything can be adjusted or treated.
Knowing When to Seek Medical Advice
It is particularly important to seek advice if memory changes happen alongside other symptoms such as speech problems, weakness or numbness, seizures, worsening headaches, vision changes, balance problems, or noticeable changes in behaviour or personality.
Our Brain Tumour Symptoms page explains the wider signs and symptoms that may need medical attention.
Everyday Strategies That May Help
Small changes can make everyday life easier when memory and concentration are affected.
You may find it helpful to keep important information in one place, use a diary, calendar or phone reminders, write down appointments and instructions, complete one task at a time, reduce background noise when concentrating, allow extra time to process information, keep routines as consistent as possible and rest when fatigue makes concentration harder.
Family members and carers can help by repeating important information calmly, keeping instructions simple and avoiding giving too much information at once.
Memory changes can be difficult for everyone involved.
A person may feel embarrassed, frustrated or anxious when they cannot remember something that previously came easily. Family members may also need time to adjust to changes in communication or routine.
Patience can help. Try to avoid correcting every small mistake or testing someone’s memory unnecessarily. Instead, offer reminders, write important information down and give the person time to process what has been said.
Our Brain Tumour Support for Families page offers further practical guidance for carers, partners and loved ones.
Start here: quick, helpful answers from our brain tumour charity North East.
If you still have questions, please do get in touch.
Yes. A brain tumour can sometimes affect memory, concentration and clear thinking, particularly when it affects areas of the brain involved in memory and language.
Yes, some people may experience short-term memory problems, such as forgetting recent conversations, appointments or instructions.
The temporal lobe plays an important role in memory and language, although memory relies on several connected areas of the brain working together.
Yes, confusion can sometimes occur, depending on the tumour’s location and other factors such as treatment, swelling, fatigue or medication.
Yes. Fatigue can make concentration and memory more difficult, especially when someone is already physically or mentally tired.
Yes. New, worsening or persistent memory problems should be discussed with a GP or clinical team, particularly if they are affecting everyday life or happening alongside other neurological symptoms.
Brain tumour memory problems can range from mild forgetfulness to more noticeable changes in concentration, language and everyday thinking. The experience can vary greatly depending on the part of the brain affected, treatment and other factors such as fatigue. Although memory problems can have many possible causes, changes that are new, persistent or worsening should always be discussed with a healthcare professional. If you or someone close to you is coping with memory changes after a brain tumour diagnosis, The Three Tumours is here to provide practical guidance, support and links to further help.
