The main causes of lymphatic follicular hyperplasia at the root of the tongue are as follows: 1. Patients with chronic pharyngitis and tonsillitis have a large amount of lymphatic tissue at the root of the tongue in the pharynx, which has to be involved in immunity causing lymphatic follicular hyperplasia at the root of the tongue during inflammation; 2. If the posterior teeth of the lower jaw have pulpitis, periapicalitis, periodontitis or pericoronitis of the wisdom teeth, the infection caused will spread to the root of the tongue, causing lymphatic follicular hyperplasia at the root of the tongue; 3. Herpes virus infection caused by viral pharyngitis, which causes blisters and ulcers at the throat, can also lead to lymphatic follicle hyperplasia at the root of the tongue; 4. Inflammation of the contour papillae at the root of the tongue due to viral infection, fungal infection or chemical mechanical stimulation, which leads to red, swollen and painful papillae at the root of the tongue, which can be accompanied by lymphatic follicle hyperplasia; 5. Sharp tips of the back teeth or poor restorations that always bite or scrape the root of the tongue leading to ulcers, which can also cause hyperplasia of lymphatic follicles at the root of the tongue.