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www.reference.com/article/causes-tumors-493227802420d301

Benign tumors are the result of abnormal cell growth that can be caused by factors such as radiation exposure, genetic mutations, infections, stress and trauma, explains WebMD. Cancerous tumors are caused by a traveling cancer cell in the body that damages tissues and begins dividing, notes Medical

www.reference.com/article/fibroid-tumors-breast-treated-14fbd4ac1294e458

Fibrous breast tumors are most commonly treated with surgery, according to WebMD. These types of tumors are known as fibroadenomas and are most commonly benign tumors. Fibroadenomas are also the most common type of benign breast tumor overall.

www.reference.com/article/causes-tumors-dog-15c8fc0c6efb59b3

Some of the causes of tumors in a dog include old age, poor oral care and breed of the dog, explains WebMD. Dogs that have not been spayed also have a higher instance of mammary gland tumors.

www.reference.com/article/stomach-tumor-treatment-341717432a6c35b

Treatment of stomach tumors range from removing the tumor endoscopically if it is small, to an operation that removes the pancreas and the duodenum, according to the National Center for Biotechnology Information (NCBI). The latter procedure is done if the doctor suspects that the tumor is cancerous.

www.reference.com/article/tumor-stomach-4176f5b01786a92

A tumor in the stomach may be the result of stomach or gastric cancer, according to WebMD. However, there are some known instances of benign stomach tumors.

www.reference.com/article/types-stomach-tumors-46db994c17767a9

Some types of stomach tumors are adenocarcinomas, primary gastric lymphomas, GISTs, carcincoids and metastatic deposits, according to Florida Hospital Medical Center. Benign stomach tumors are classified as non-neoplastic and neoplastic.

www.reference.com/article/cancerous-tumor-called-3508b29f082ab58

A malignant tumour is a cancerous tumour, and it contains cells that have the ability to spread and invade surrounding tissues and organs. This type of tumour can cause damage that is potentially fatal.

www.reference.com/article/brain-tumor-bc8d0c82724f98ae

A brain tumor is tissue mass that is formed by abnormal cells, defines WebMD. Tumors do not die like normal cells do. Brain tumors can be both noncancerous or malignant. Cancerous brain tumors grow faster than noncancerous ones, and they attack surrounding tissue.

www.reference.com/article/symptoms-brain-tumor-e32404638af4a725

Symptoms of a brain tumor include unexplained nausea or vomiting, changes in behavior or personality, headaches that gradually increase in frequency and severity, and new onset or change in pattern of headaches, according to Mayo Clinic. Brain tumors may also cause vision problems such as double vis

www.reference.com/article/causes-brain-tumors-6143dfc9d0d13b63

Mayo Clinic indicates primary brain tumors are caused by normal cells that mutate to form a mass of abnormal cells in the brain. Secondary brain tumors are more common, and these types of tumors form after cancer from another part of the body spreads to the brain.