Brain Tumor Symptoms & Signs, Causes and Screening | AMO

The symptoms of brain cancer vary depending on where the tumor grows. The main symptoms are as follows, and a patient may develop one or more of these symptoms:

• Persistent headache
• Nausea and vomiting
• Sudden change in vision
• Change in the state of consciousness, such as becoming somnolent, comatose, unresponsive and irritable
• Loss of sense of balance
• Urination or defecation disorders

Causes of most brain cancers are unknown, while genetic or environmental factors may play a role. However, persons engaged in certain jobs are more likely to develop cancer, such as gas station workers, employees of pharmaceutical factories and those who handle preservatives. As for whether long-term use of mobile phones would increase the risk of brain cancer, there is no clear evidence at present.