to trype to help your immune system fight cancer, it can also cause your immune systemav to attack healthy parts of your body. this can happen duringe or aftr treatment and may be severes, and lead to death. so your doctor right away ift you have cough, shortness of breath, chest pain, diarrhea, severe stomachir pain or tenderness, severe nausea, vomiting, headache, light vomiting, headache, light sensitivity, irregular heartbeat, extreme tiredness, constipation,nf dizziness or fainting, changes dizziness or fainting, changes in appetite, thirst for confusion,e memory problems, muscle pain or weakness. fever, rash, itching or, fever, rash, itching or, flushing . nsplant, fever, rash, itching or, flushing these are not all the possible side effects. your medical conditionsla, including immune system problems or if you ve had an organ transplant, hadte a plan o have a stem cell transplant or have had radiation to your chest area or a nervousru conditioned to feel good to be here for the