What are Brain Lesions?

What are Brain Lesions?

A lesion is any damage in an organ or body tissue caused by disease or trauma.

Brain lesions occur for a variety of reasons and are caused by brain tumors (both cancerous and non-cancerous), as well as lesions caused by trauma, infection, genetic disorders, immune system reactions, plaque or radiation. Some examples of brain lesions are those caused by:

Poor Blood Flow

Problems with blood flow to the brain are caused by blood clots, blockage of blood flow, abnormal growths, and plaque within the blood vessel. Blood carries oxygen and nutrients to the brain and if blood flow is compromised then a stroke may occur. An “infarct” is a lesion caused by problems with blood flow to the brain.

Multiple Sclerosis

Multiple Sclerosis (MS) is an immune disease of the brain and spinal cord and the name means “scars” or “lesions.” Lesions caused by MS often appear in the white matter of the brain and spinal cord where brain signaling takes place.

Traumatic Brain Injuries

A traumatic brain injury causing swelling and bleeding inside the brain. Swelling and bleeding increases pressure within the scull that can compress the brain and damage it.


There are many types of brain tumors. Tumors cause problems as they increase pressure within the skull and can lead to brain damage.


Lesions are used as a treatment for epilepsy. Lesions intentionally made for treatment can be caused by ablation or electrical shocks.


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