A lump on the right side of the neck is painless and itchy, and the possible causes include enlarged cervical lymph nodes, thyroid disease, benign soft tissue nodules, distant metastasis of malignant tumors and so on. 1. Enlarged lymph nodes in the neck: inflammation and tuberculosis of the lymph nodes in the neck can cause enlarged lymph nodes, appearing as a lump in the neck, and ultrasonic examination of the neck can be clear. 2. Thyroid diseases: thyroid tumors, nodular goiter, thyroid inflammation, etc., can appear as neck lumps, and with the gradual increase of the lumps, pain symptoms will appear. 3. benign soft tissue nodule: such as lipoma, fibroma, sebaceous cyst in the neck, etc., may appear as a lump in the neck, which is painless and itchy, and is usually soft in texture, clear in boundary and good in mobility. 4. Distant metastasis of malignant tumors: when malignant tumors such as gastric cancer and lung cancer have distant metastasis, painless and relatively hard lumps may appear in supraclavicular, infraclavicular and neck. There may be other reasons for the lump on the right side of the neck, so it is recommended to go to the hospital in time, and give targeted treatment or therapy after completing the examination and clarifying the cause of the disease under the guidance of the doctor.