ENT Liu Knowledge Base Head & neck tumours · physician reviewed
Oral Cavity Cancer · Symptoms & diagnosis

When should a mouth ulcer be biopsied?

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

Any oral ulcer, white or red patch, lump or unexplained loose tooth that persists for more than two to three weeks should be examined by a dentist or ENT surgeon and usually biopsied. Pain is not a reliable guide — early oral cancers are often painless, and repeated courses of antibiotics or antifungal treatment are the commonest cause of diagnostic delay.

In detail

A biopsy is a small outpatient procedure. Non-healing extraction sockets, unilateral tonsil or tongue enlargement, numbness of the lower lip or chin and progressive limitation of mouth opening are additional red flags.

What this means in practice: this answer is part of the “Symptoms & diagnosis” 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. About Head and Neck Cancer American Cancer Society · 2025
  2. Head and Neck Cancers (patient information) US National Cancer Institute · 2025

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.