Lymph nodes on the neck feel hard, consider with lymphadenitis, tumor metastasis and other factors, need to go to the hospital for further examination to clarify the cause of the disease. 1. Lymphadenitis: it may be due to the inflammatory mediators of lymph nodes stimulating the local lymph nodes, which in turn causes the phenomenon of lymph nodes feeling hard on the neck. Lymphadenitis usually presents symptoms such as redness, swelling, fever, pain and etc. In acute inflammatory infection of lymph nodes, there is tenderness on palpation, and the surface is smooth. In acute inflammatory infection of lymph nodes, there is tenderness on palpation, and the surface is smooth, hard and movable; when the inflammation gradually subsides, the symptoms are gradually relieved. 2. Tumor metastasis: usually due to lymphatic metastasis of malignant tumors, which can lead to lymph node metastasis in the neck, these lymph nodes are hard on palpation, without obvious tenderness, with poor mobility, and some of them can be fused. If the phenomenon of hardening of lymph nodes on the neck occurs, you should go to the hospital in time, improve the examination, and give the corresponding treatment after clear diagnosis, so as to avoid the delay of the condition and the adverse consequences.