How Long Do the Side Effects of a Pneumonia Shot Last?

Although normal side effects of the pneumonia shot are generally mild and go away within a few days, in rare cases some individuals may experience more severe side effects, such as fever, significant swelling, pain and muscle aches. Even fewer people experience a severe allergic reaction to the vaccine, but those who do require immediate medical attention, explains WebMD. Some signs of a severe allergic reaction include breathing difficulty, hives and rapid heartbeat.