Risk factor is anything that increases the chances of getting a disease.

1. Smoking
2. Alcohol consumption
3. Obesity
4. Male sex
5. Older age 50-60 years
6. Gastroesophageal reflux-a disease in which stomach content leak backward into the esophagus from the stomach causing heart burn
7. Diet low in fruits and vegetables
8. Hot beverages
9. Nitrosamines exposure (e.g., cured meat, fish, bacon)
10. Radiotherapy
11. Human papillomavirus