Will kissing transmit mouth ulcers?

Mar 03, 2025 Source: Cainiu Health

Dr. Liu Chao

Introduction

Oral ulcers are caused by factors such as an individual's immune status, lifestyle habits, nutritional condition, and local trauma. Ulcers resulting from these factors are not contagious. Even during kissing where saliva may be exchanged, oral ulcers cannot be transmitted to others because they are not caused by infectious pathogens.

In most cases, mouth ulcers are not transmitted through kissing. However, ulcers caused by viral or bacterial infections may be contagious. If abnormalities occur, it is recommended to seek medical attention promptly. Detailed analysis is as follows:

Mouth ulcers are caused by factors such as an individual's immune status, lifestyle habits, nutritional condition, and local trauma. Ulcers resulting from these factors are not contagious. Even during kissing when saliva is exchanged, mouth ulcers are not transmitted to others because they are not caused by infectious pathogens.

However, if mouth ulcers are caused by oral herpes virus infection or certain bacterial infections such as streptococcus or Staphylococcus aureus, these infectious ulcers may be transmitted to others through direct contact, such as kissing or via respiratory droplets.

Individuals with mouth ulcers should maintain good oral hygiene habits before kissing, such as brushing teeth and rinsing the mouth, to reduce the risk of transmission.

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