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Oral Cavity Cancer · Understanding the disease

Why is oral cancer so common in India and South Asia?

Reviewed: 8 November 2026 By: Xiangpeng Liu, MD Topic: Oral Cavity Cancer Answer length: short, citable
Quick answer

Because chewing tobacco, betel quid and areca nut are widely used and are held directly against the cheek and gum for long periods. These products are IARC Group 1 carcinogens; an estimated 70–80% of Indian oral cancers are attributable to tobacco and areca nut, producing a characteristic buccal mucosa cancer pattern.

In detail

More than 360 million people worldwide use smokeless tobacco, 77% of them in low- and middle-income countries, and use is increasing in Bangladesh, India and Nepal. A 2022 estimate attributed over 120,000 oral cancer cases (about 30%) to smokeless tobacco, areca nut or both.

The same carcinogen explains the different anatomical pattern: "Indian oral cancer" frequently starts in the buccal mucosa, while tongue and floor-of-mouth cancers are more typical in smoking/drinking populations in Europe and North America.

What this means in practice: this answer is part of the “Understanding the disease” section of the Oral Cavity Cancer topic. If you are comparing treatment options, also read how to compare a second opinion and which records to send.

Other common questions about oral cavity cancer

See all 15 questions in this topic →

Sources for this answer

  1. Oral cancer burden and mortality in India: a GLOBOCAN 2022 analysis with regional comparison ecancermedicalscience · 2026 · 143,759 new oral cancer cases and 79,979 deaths in India in 2022.
  2. Smokeless Tobacco and Oral Cancer in Global Perspective New England Journal of Medicine · 2026 · More than 360 million users of smokeless tobacco; ~120,000 oral cancer cases attributable to smokeless tobacco, areca nut or both in 2022.
  3. IARC Monographs on the Identification of Carcinogenic Hazards to Humans (tobacco, areca nut, UV radiation, EBV, HPV) International Agency for Research on Cancer / WHO · 2024

Written and medically reviewed by Xiangpeng Liu, MD

Associate Chief Physician, ENT & Head/Neck Surgery · Chenzhou First People’s Hospital, Chenzhou, Hunan, China

Editorial policy & reviewer credentials · All sources

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Medical disclaimer: This knowledge base is general information for people researching head and neck tumours, not a diagnosis or treatment plan. It does not replace an examination by a qualified physician. Survival figures are population averages, not predictions for an individual. Treatment and cost estimates for China are illustrative only and must be confirmed in writing after your records have been reviewed. If you have a symptom lasting more than two to three weeks, see a doctor promptly.