Can oral cancer occur in non-smokers and non-tobacco users?

Oral cancer has long been associated with tobacco use, whether through smoking or chewing. In India, this connection is especially strong, with tobacco remaining the leading cause of most oral cancer cases.

However, doctors are now observing a growing number of patients who have never used tobacco developing the disease.

This shift is raising awareness about a critical but often overlooked fact: oral cancer is not limited to smokers or tobacco users. Several other factors, ranging from viral infections to lifestyle habits and environmental exposure, can increase the risk, even in otherwise healthy individuals.

Experts say that understanding these risks is crucial, especially because cases where non-tobacco users are often diagnosed late due to lack of awareness.

HPV: A LEADING CAUSE IN NON-SMOKERS

Dr Tasneem Bharmal, Consultant Medical and haemato-oncologist at Saifee Hospital, explains that one of the most common causes of oral cancer in non-smokers is infection with the human papillomavirus (HPV).

“The most common cause of non-smoking, non-tobacco-related head and neck cancer is human papillomavirus (HPV). It is one of the leading causes of head and neck malignancies in the developed world, and in India, its incidence is steadily rising among head and neck cancers,” she says.

HPV-associated oropharyngeal cancer is now among the most frequently diagnosed types, particularly in younger men and women. The virus is commonly transmitted through oral sex.

Doctors also highlight that the HPV vaccine, originally introduced to prevent cervical cancer, can help reduce the risk of these cancers in both men and women.

POOR ORAL HYGIENE AND CHRONIC IRRITATION

Another major factor contributing to oral cancer in non-tobacco users is poor oral hygiene. According to experts, long-standing dental issues can lead to repeated damage inside the mouth.

Dr Bharmal notes that persistent mouth ulcers caused by poor oral care can gradually become dysplastic, meaning the cells start showing abnormal changes that may turn cancerous over time.

In addition, sharp or broken teeth and ill-fitting dentures can continuously irritate the lining of the mouth. This repeated friction or injury can trigger changes in the cells, increasing the risk of cancer.

OTHER RISK FACTORS YOU SHOULDN'T IGNORE

Dr Smit Sheth, Cancer Physician at MOC Cancer Care, Mulund, emphasises that several other factors may contribute to oral cancer in non-smokers.

“While tobacco and alcohol significantly increase risk, they are not the only causes. Several other factors can contribute to the development of oral cancer,” he explains.

These include:

• Nutritional deficiencies: A diet low in fruits and vegetables can weaken the body’s natural defence system

• Environmental exposure: Prolonged sun exposure, especially affecting the lips, may increase cancer risk

• Air pollution: Increasingly being studied for its possible link to head and neck cancers

• Genetics: Some individuals may have a higher inherent risk due to family history or biological factors

WHY DIAGNOSIS IS OFTEN DELAYED

One of the biggest challenges with oral cancer in non-smokers is delayed diagnosis. Since these individuals are not considered high-risk, early warning signs are often ignored.

Dr Sheth points out that symptoms may be mistaken for minor issues, leading to late detection. Common warning signs include:

• A non-healing ulcer in the mouth

• Red or white patches

• Persistent pain or discomfort

• Difficulty swallowing

• A lump in the neck

Ignoring these symptoms can allow the disease to progress, making treatment more complicated.

PREVENTION AND EARLY DETECTION ARE KEY

Doctors stress that regular dental check-ups and maintaining good oral hygiene can significantly reduce the risk of oral cancer.

Early detection plays a crucial role in successful treatment. Any symptoms that do not heal within two weeks should be evaluated by a healthcare professional, even if you have never used tobacco.

Oral cancer is no longer just a smoker’s disease. While tobacco remains a major risk factor, it is not the only one. Viral infections like HPV, poor oral hygiene, chronic irritation, and environmental factors can all contribute to the disease.

As experts highlight, awareness is the first step toward prevention. Recognising that oral cancer can affect anyone, not just tobacco users, can help ensure timely diagnosis and better outcomes.