Hard lumps after cervical lymphatic radiotherapy may be a side effect of radiotherapy or other conditions. 1. radiotherapy side effects: cervical lymph nodes after radiotherapy hard lumps may be radiotherapy side effects, radiotherapy side effects can also appear in the affected area of dermatitis, peeling children or ulceration, redness and swelling and other side effects. If the hard lumps caused by radiotherapy generally do not need to worry too much, you can massage the affected area with hot compresses. 2. Other cases: hard lumps appear after radiotherapy of lymph nodes in the neck, which may be the scar left by the surgery, or the manifestation that the surgery of lymph node tumor in the neck is not done cleanly. In order to understand the situation of hard lumps, it is necessary to do imaging examination, tumor marker examination, pathology examination and so on; patients with hard lumps after cervical lymphatic radiotherapy should actively consult the doctor to avoid delaying the condition, and the patients should not use medicine by themselves.