The difference between lymph nodes and lymphoma

My aunt has not been in good health recently, especially in the past few days. She felt a sharp pain in her neck, and later she developed a fever, which has not gone away yet. The pain is particularly severe when she presses her jaw with her hand. I have looked up a lot of information, and some say it is chronic lymphadenitis, while others say it is lymphoma. So what is the difference between the lymph nodes in the neck and lymphoma?

The first difference between the two is the difference in symptoms. Chronic lymphadenitis is generally manifested by swollen and tender lymph nodes under the mandible, chin and deep neck; while lymphoma is generally manifested by swollen lymph nodes accompanied by systemic symptoms such as fever, itching, night sweats and weight loss.
The difference between lymphitis and lymphoma is that their causes are different. Lymphitis is caused by various odontogenic infections, jaw inflammation, oral mucosal infections and ulcers, tonsillitis and pharyngitis, and infections of the ears, nose, throat, eyes, skin and salivary glands. The cause of pediatric lymphoma is not very clear. Pathogen infection, radiation, chemical drugs, and combined autoimmune diseases can all cause lymphoma.