Symptoms and causes

Symptoms

The symptoms of glioma vary by tumor type as well as the tumor's size, location and rate of growth.

Common signs and symptoms of gliomas include:

  • Headache
  • Nausea or vomiting
  • Confusion or a decline in brain function
  • Memory loss
  • Personality changes or irritability
  • Difficulty with balance
  • Urinary incontinence
  • Vision problems, such as blurred vision, double vision or loss of peripheral vision
  • Speech difficulties
  • Seizures, especially in someone without a history of seizures

When to see a doctor

Make an appointment with your doctor if you have persistent signs and symptoms that concern you.

Causes

Like most primary brain tumors, the exact cause of gliomas is not known. But there are some factors that may increase your risk of a brain tumor.

Risk factors

Risk factors include:

  • Your age. Your risk of a brain tumor increases as you age. Gliomas are most common in adults between 60 and 80 years old. However, a brain tumor can occur at any age. Certain types of gliomas, such as ependymomas and pilocytic astrocytomas, are more common in children and young adults.
  • Exposure to radiation. People who have been exposed to a type of radiation called ionizing radiation have an increased risk of brain tumor. Examples of ionizing radiation include radiation therapy used to treat cancer and radiation exposure caused by atomic bombs.

    More-common forms of radiation, such as electromagnetic fields from power lines and radiofrequency radiation from cellphones and microwave ovens, have not been shown to increase the risk of glioma.

  • Family history of glioma. It's rare for glioma to run in families. But having a family history of glioma can double the risk of developing it. Some genes have been weakly associated with glioma, but more study is needed to confirm the link between these genetic variations and brain tumors.
Aug. 10, 2017
References
  1. Central nervous system cancers. Fort Washington, Pa.: National Comprehensive Cancer Network. http://www.nccn.org/professionals/physician_gls/f_guidelines.asp. Accessed April 29, 2014.
  2. Winn RH. Youmans Neurological Surgery. 6th ed. Philadelphia, Pa.: Saunders Elsevier; 2011. http://www.clinicalkey.com. Accessed April 29, 2014.
  3. Stupp R, et al. High-grade malignant glioma: ESMO clinical practice guidelines for diagnosis, treatment and follow-up. Annals of Oncology. 2010;21:v190. http://annonc.oxfordjournals.org/content/21/suppl_5/v190.full.pdf+html. Accessed Nov. 4, 2014.
  4. Brain SPOREs. National Institutes of Health. http://trp.cancer.gov/spores/brain.htm. Accessed April 29, 2014.
  5. Moynihan TJ (expert opinion). Mayo Clinic, Rochester, Minn. May 12, 2014.
  6. Glioma. American Brain Tumor Association. http://www.abta.org/brain-tumor-information/types-of-tumors/glioma.html. Accessed Nov. 6, 2014.
  7. Omuro A, et al. Glioblastoma and other malignant gliomas: A clinical review. Journal of the American Medical Association. 2013;310:1842. http://jama.jamanetwork.com/article.aspx?articleid=1764056. Accessed Nov. 4, 2014.
  8. Astrocystoma. American Brain Tumor Association. http://www.abta.org/brain-tumor-information/types-of-tumors/astrocytoma.html. Accessed Nov. 6, 2014.
  9. Ependymoma. American Brain Tumor Association. http://www.abta.org/brain-tumor-information/types-of-tumors/ependymoma.html. Accessed Nov. 6, 2014.
  10. What you need to know about brain tumors. National Cancer Institute. http://www.cancer.gov/cancertopics/wyntk/brain.pdf. Accessed Nov. 6, 2014.
  11. Armstrong TS, et al. Use of complementary and alternative medical therapy by patients with primary brain tumors. Current Neurology and Neuroscience Reports. 2008;8:264.
  12. Adult brain tumors treatment (PDQ): Health professional version. National Cancer Institute. http://www.cancer.gov/cancertopics/pdq/treatment/adultbrain/healthprofessional. Accessed Nov. 6, 2014.
  13. Taylor L. Diagnosis, treatment and prognosis of glioma: Five new things. Neurology: Clinical Practice. 2010:S28. http://www.neurology.org/content/75/18_Supplement_1/S28.full. Accessed Nov. 4, 2014.
  14. Rice EM. Decision Support System. Mayo Clinic, Rochester, Minn. Jan. 20, 2015.