Neck feeling a bag inside is usually caused by lymphadenitis, lipoma, thyroid cysts and other diseases, and can be treated with medicines (such as cefadroxil, etc.), surgery, etc. as prescribed by the doctor. 1. Lymphadenitis: it is caused by the infection of lymph nodes by pathogenic bacteria, and it occurs in the neck, armpit and other parts of the body. Clinical manifestations include enlargement of lymph nodes, pain, etc., which leads to the patient’s self-consciousness of having a bag inside the neck and may be accompanied by fever, fatigue and other symptoms. Cephalosporin, penicillin sodium, roxithromycin and other antibiotics can be used as prescribed by the doctor to control the infection, accompanied by fever and pain, compound acetylsalicylic acid tablets, ibuprofen and so on can be used. When abscess is formed, surgical treatment such as puncture and suction of pus, incision and drainage can be taken. 2. Lipoma: related to heredity, abnormal fat metabolism and other factors, the patient’s neck, shoulder, arm and other parts of the body can feel an elastic bag, the hand gently pushed can be slightly moved. If there is no uncomfortable symptom, usually no treatment is needed, and attention should be paid to observing its changes and regular review; if the volume is too large and causes discomfort or affects the appearance, surgical resection can be carried out. 3. Thyroid cysts: Usually there are no obvious symptoms, but painless lumps in the neck may appear. If the lumps are large in size or have a tendency to bleed, they may cause local pain, dyspnea, and hoarseness, etc. If the patient does not have cancerous lesions and has no obvious symptoms, it is usually not necessary to treat them. If the patient is not cancerous and has no obvious symptoms, he/she can undergo regular review. If the cyst is large in size, surgical drainage or excision is required. In addition, there are many other reasons that can cause a bag inside the neck feeling, it is recommended to go to the hospital in time to find out the cause of the disease, and then receive treatment as soon as possible.