A lump in the neck may be caused by enlarged cervical lymph nodes, sebaceous cysts and thyroid disorders. 1. Enlarged lymph nodes in the neck: when patients have recently developed upper respiratory tract infections, such as colds and pharyngitis, lumps will appear in the neck due to the local need for a large number of immune cells and inflammatory factors to gather, and the active function of lymph nodes, resulting in enlarged lymph nodes in the neck. 2. Sebaceous cysts: human skin is rich in sebaceous glands, when the sebaceous glands secrete abundantly, the local discharge is not smooth, then may form a blockage, sebaceous cysts may occur, sebaceous cysts can occur in the whole body of the skin in any part. Sebaceous cysts can occur in any part of the skin of the body. When it occurs in the skin of the neck, it will produce the symptom of neck lumps. 3. Thyroid disease: Hyperthyroidism may cause the thyroid gland to become enlarged and increase in size, thus producing the symptom of a lump in the neck. When the patient holds the appearance of neck lumps, should go to the hospital in time, clear cause of the disease and actively cooperate with the doctor’s treatment.