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Cancer health centre

Brain cancer symptoms

Brain cancer causes tumours in the brain, which may or may not cause symptoms depending on the type and size of the tumour.

A tumour can put pressure on the brain causing headaches, fits or seizures, or can affect how parts of the brain work.

The symptoms of brain tumours can be mistaken for other medical conditions.

The following symptoms are most common:

  • Headache
  • Weakness
  • Clumsiness
  • Difficulty walking
  • Seizures

Other nonspecific symptoms and signs include the following:

  • Altered mental status - changes in concentration, memory, attention, or alertness
  • Nausea, vomiting - especially early in the morning
  • Abnormalities in vision
  • Difficulty with speech
  • Gradual changes in intellectual or emotional capacity

In many people, the onset of these symptoms is very gradual and may be missed by both the person with the brain tumour and their family. Occasionally, however, these symptoms appear more rapidly. In some instances, the person has symptoms or signs that resemble those of a stroke.

Examinations and tests

The findings of your medical interview and physical examination will probably suggest to a doctor, whether your GP or an accident and emergency doctor, that you have a problem with the brain or brain stem.

  • In most cases, you will have a CT scan of the brain.
  • This test is like an x-ray but shows more detail in three dimensions.
  • Usually, a harmless dye is injected into your bloodstream to highlight abnormalities on the scan.

People with brain cancer often have other medical problems. Therefore, routine laboratory tests may be performed.

These include analysis of blood count, kidney and liver function tests, and a blood clotting profile.

If you have mental state change as the main symptom, blood or urine tests may be carried out to detect drug use or infection.

More and more, the MRI scan is being used instead of CT scan for suspected brain tumours. This is because MRI has a higher sensitivity for detecting the presence of, or changes within, a tumour.

Skull X-rays are not widely used any longer to diagnose brain cancer.

If your scans indicate the presence of a brain tumour, you will be referred to a specialist in cancer (oncologist). 

The next step in diagnosis is confirmation that you have a cancer. A small sample of the mass (a biopsy) is taken to identify the type of tumour.

  • The most widely used technique for obtaining a biopsy is surgery. The skull is opened, usually with the intention of removing the whole tumour if possible. A biopsy is then taken from the tumour.
  • If the surgeon is unable to remove the entire tumour, a small piece of the tumour is removed.
  • In some cases it is possible to collect a biopsy without opening the skull. The exact location of the tumour in the brain is determined stereotactically, that is, by using CT of MRI scan while the head is held still in a frame. A small hole is then made in the skull and a needle guided through the hole to the tumour. The needle collects the biopsy and is removed. This technique is called stereotaxis, or stereotactic biopsy.
  • The biopsy is examined under a microscope by a pathologist (a doctor who specialises in diagnosing diseases by looking at cells and tissues).

WebMD Medical Reference

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