Good night,My mom has a low grade lymphoma.  Shes suffering from fluid on the lungs which inhibits her to lie down and sleep.  She often times complains that shes cold - then hot, then cold.  Is that an internal fever?  She started her chemo treatment last Friday, but these symptoms were from before that.
Almost 80-90% of people with cancer will have low grade fevers. It is due to a combination of increased metabolic activity from the cancer and increase in substances released from the cancer, as well as the cancer itself. The fevers could also be from the fluid in her lungs. If she spikes a fever of greater than 101, you should take her to the emergency room. Otherwise, give her Tylenol for fevers to help make her comfortable.