Ref: * Major etiological factor: HPV-16 and Tobacco exposure.* 75% of head and neck cancers are caused by tobacco and alcohol use.* HPV type 16: risk factor for oropharyngeal cancers that involve the tonsils or the base of the tongue.* Paan (betel quid): most common risk factors among south Asian.* EBV is a risk factor for nasopharyngeal and salivary glands cancer.* Preserved or salted foods: Salted foods during childhood are a risk factor for nasopharyngeal cancer.* Vitamin D deficiency is a risk factor for head and neck squamous cell carcinoma (HNSCC).">