A bulge protruding from the back of a lymphoma patient may or may not be painful. Lymphoma patients usually do not have a bulge protruding from their back. The bulge may be caused by a cyst, lipoma, septic infection, or other factors, not necessarily lymphoma. The bulge may not be painful in the early stages, but if the bulge gradually increases in size and presses on the surrounding nerves, it may cause pain. Common symptoms of lymphoma are enlarged lymph nodes, fever, loss of body weight, chest pain, difficulty breathing, diarrhea, and abdominal lumps. In order to understand the cause of the bulge, it is necessary to improve the ultrasound and other tests, and if necessary, to do a pathological biopsy. Lymphoma patients with a bulge protruding from the back are recommended to consult a doctor in time, improve the examination, clarify the cause of the disease, and actively treat it.