A brain tumor is the excessive or mass growth of abnormal cells inside your brain. There are numerous brain tumors such as noncancerous, know as the benign tumor and cancerous, known as the malignant brain tumor. Malignant tumor primarily grows faster than that of those noncancerous tumors and aggressively invading the surrounded tissues. Brain cancer rarely spreads across another part of the body but, it might spread across the other parts of the brain and central nervous system.

Symptoms of a brain tumor
The symptom of any brain tumor depends on the stage or size of the tumor that has been growing inside the brain. Generally, the signs and symptoms of a brain tumor may include the following.

• Headaches, which are new onset
• Severe or frequent headaches
• Chills and fever while sleeping at night
• Difficulty in concentrating and analyzing any situation
• Unexplained nausea or vomiting
• Fatigue and muscle weakness
• Loss of sensation among different parts of the body
• Behavioral changes
• Memory loss and blurred vision

Causes of brain tumor
The causes of a brain tumor depend upon the place from where they have originated. In simpler words, the primary brain tumor develops inside the brain whereas the secondary brain tumor starts developing somewhere else in the body.

Primary tumor
The formation of a primary tumor of the brain starts when normal cells acquire errors (mutations) in their DNA. This mutation allows cells to grow and then divide at an increased rate which, continues to live with healthier cells and kill them. This results in the majority of abnormal cells which adds up to form a tumor cell.

Secondary tumor
A secondary brain tumor is a result of untreated tumors which have initiated anywhere in the human body spread or metastasize to the brain. The secondary brain tumor often occurs in an individual with a history of cancer but, in some cases, a metastatic brain tumor might be a sign of cancer growing in some other part of the body. Some of the common types of cancers that spread to the brain are breast cancer, lung cancer, colon cancer, and kidney cancer.

Risk factors for a brain tumor
There is no particular reason for the occurrence of a brain tumor; however, doctors and scientists have discovered a few factors that might increase the risk for a brain tumor

Radiation
Excessive exposure to radiations specifically, ionizing radiation, has an increased probability of causing a brain tumor. Examples of ionizing radiation are radiation therapy used to treat cancers and atomic radiations

Family history
An individual who has a history of a brain tumor in their family or who has a family history of a genetic syndrome is likely to increase the risk of brain tumor.