Stones located on the surface of the tonsils can be seen with the naked eye, while stones located on the back or underneath of the tonsils can only be seen with the aid of an indirect laryngoscope or an electronic laryngoscope. 1. Tonsil surface stones: white or yellow speckled material on the surface of the tonsils can be seen with the naked eye. There are no specific symptoms when the stones are small. Larger stones can cause bad breath, difficulty in swallowing and other symptoms. 2. Stones at the back of or under the tonsils: they cannot be seen with the naked eye, but through laryngoscopy, there are grayish-white or white substances in varying quantities, shapes and textures in the tonsillar crypts. A few patients have symptoms such as bad breath and difficulty in swallowing. The combination of probe examination and imaging can lead to a definitive diagnosis. When patients with tonsil stones have symptoms such as foreign body sensation in the throat and bad breath, it is recommended to consult a doctor promptly and follow the doctor’s instructions for standardized treatment.