Two bulges on the left side of the neck may be caused by lymphadenitis, thyroid disease, sebaceous cysts, and tumor-like lesions of lymph nodes. 1. Lymphadenitis: due to bacterial, viral and other pathogens infection, patients appear lymph node enlargement, bulging and other symptoms. 2. Thyroid diseases: such as multinodular goiter, thyroid cancer, thyroid adenoma and other diseases, patients may have two bulges on the left side of the neck. 3. Sebaceous cysts: due to localized sebaceous stasis, if it occurs on the left side of the neck, patients may have two bulges on the left side of the neck. 4. Lymph node tumor lesions: commonly found in breast cancer, lung cancer and other diseases transferred to the lymph nodes on the left side of the neck, or primary lymphoma and other diseases, patients may have two bulges on the left side of the neck. There may be other reasons for the two bulges on the left side of the neck, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy.