Why do flu jabs hurt

Our bodies begin producing antibodies that provide protection against infection with the virus strains in the vaccine. The influenza vaccine contains an inactivated virus, which is a "dead" virus designed to look like the actual influenza virus. Even though these viruses cannot make you sick, your immune system detects the virus as a threat and begins to fight it. Swelling, redness and soreness are common after the flu shot and can last hours.

Mora recommends getting the flu shot in the arm you use the least. Some other ways to reduce pain include trying not to tense your arm while you're being vaccinated and moving your arm after vaccination or exercising to increase blood flow and help disperse the vaccine throughout the area.

The flu vaccine will not give you the flu. However, some people do experience side effects. While redness, swelling, muscle aches and sometimes low-grade fevers temperatures under degrees F are typical side effects after receiving an influenza vaccination, there can be some rare and serious side effects including difficulty breathing and swelling around the eyes or lips. If you are experiencing dizziness, a racing heart or a high fever greater than seek medical attention right away.

Consider an alternative vaccine. There are options! We also offer a nasal spray vaccine, which is available for healthy, non-pregnant individuals between the ages of 2 and It's great for people who are afraid of needles or children that can't sit still for a shot.

Why is my arm sore after the flu shot? Soreness in your arm after getting a flu vaccine typically lasts no longer than one or two days. The pain and inflammation is your body's natural response to a foreign invader. It's a sign that your immune system is making antibodies, which is what offers you the protection from getting the actual virus. HuffPost Personal Video Horoscopes. Follow Us. Terms Privacy Policy. Part of HuffPost Wellness.

All rights reserved. Good news: A little discomfort is a good sign. How much it hurts may depend on how the shot was administered. FotoDuets via Getty Images. The flu shot may hurt less as you get older. Ever wonder why your arm is so sore after a flu shot?

While getting influenza vaccine is a relatively painless experience for most people, some do find that the area where the needle was injected tends to be pretty sore for a day or two after the shot. Aside from being mildly annoying, it's really nothing to worry about. The longer explanation revolves around why we're giving you the vaccine in the first place.

The body takes a look at what's in the vaccine and starts developing an immune response. Your body is developing antibodies to whatever infection you're trying to prevent — in this case, influenza. That causes some swelling, redness, a little discomfort.