<s>[INST] my grandfather have cancer grade 3 and skin wall also effected now he is getting chemotherapy and the side effect is he is getting fever 102 and 100 since 5 days we gave him calpol tablet and now one more problem he is getting vomiting and not  having potty since two days [/INST] Fever in cancer patient can be due to many causes. Since the patient is receiving chemotherapy, febrile neutropenia should be suspected. It means fever in the setting of low white blood cell count. These white blood cells act as bodies police against infectious agents preventing infections. If due to chemotherapy, the white blood cell count (specifically neutrophil count) Chat Doctor.  You need to have his complete blood counts CBC test to rule out neutropenia. Meanwhile, he needs to be started empirically on levofloxacin tablet 500 mg along with paracetamol for fever. Antiemetic to prevent vomiting is also required along with intravenous fluid to prevent deny </s>