Welcome to e health forum.
Lymph node enlargement is a very common sign and can cause many people to get stressed and lose their sleep. A few major symptoms and danger signs can help you differentiate very common benign conditions and from those indicating conditions like cancer and chronic diseases.
Lymph nodes are part of the lymphatic system, where white blood cells (lymphocytes) mature and undergo clonal multiplication. The lymphocytes are important for fighting the infection and clearing the viruses and bacteria from the body. Hence during any infection it is common for the lymph nodes to increase in size and also become a bit tender (pain on application of pressure).
Lymphomas are lymphoid malignancies, which present with multiple and generalized enlargement of lymph nodes all over the body, in the abdominal and chest cavity, enlarged spleen, and / or the bone marrow within the bones. Apart from lymph node enlargement, individuals may have other non specific symptoms like fever and weight loss, loss of appetite, itchiness all over the body, excessive sweating at night, fatigue, weakness, breathlessness along with swelling of the face and neck, etc.
In case you seem to have such symptoms, then you might consult with your doctor for a examination and seek proper treatment and advice.