What causes severe lower back pain when had yellow fever vaccination?
Patient: I had yellow fever vaccination 8 days ago and woke at 2am this morning with severe lower back pain. Should I be worried. Ruth. Doctor: Dear patient No need to worry . sometimes  after yellow fever vaccination  leads to mild viral fever like symptoms that lasts for few days. Take paracetamol  500mg  thrice a days and take test. If u have serious pain start taking tablet  diclofenac  50 mg  twice a day and take adequate rest. All the best.