How long might it take side effects to show up?
Side effects might show up within one to three days after vaccination, and could last for one to three days after symptoms start. Sore arms, muscle pain, fatigue, headaches and fevers are common. Some people experience only mild discomfort, others report severe fatigue, aches and other flu-like symptoms.
Call a doctor if your side effects are causing you worry, or they don’t seem to be going away after a few days.