The presence of a sliding hard lump on the left side of the larynx may be a thyroid nodule, or a sebaceous cyst or localized lymph node. 1. Thyroid nodule: a mass in the thyroid tissue due to abnormal proliferation of thyroid cells, if it is a benign nodule with soft texture and clear boundary, it may be manifested as a hard lump that can slide. 2. Sebaceous cysts: after the sebaceous ducts are blocked, the glands swell to form cysts, which can also be manifested as a hard lump on the left side of the laryngeal node that can slide. 3. Localized lymph nodes: enlarged lymph nodes in the upper or middle depths of the neck can also manifest as a hard sliding lump on the left side of the Adam’s apple. A hard lump on the left side of the larynx can be caused by other reasons, it is recommended to go to the regular hospital in time to identify the cause of the disease and active treatment.