Top 10 Pfizer anti-Covid vaccine side effects

First of all, you need to know that severe adverse reactions are rare, only 1 of 200 people are to have them. If you are healthy and you know you are not allergic to common things, you should not worry about side effects.

If people have had allergic reactions to other vaccines in the past, health care experts recommend they talk with a doctor before getting a COVID-19 vaccine. 

Most Side effects usually kick in about 12 hours after the shot, according to O’Connor, but fade within 24 to 36 hours. 

1. Pain at injection site

Occurs to more than 1 of 10 vaccinated people

This side effect includes pain which is provoked by the soreness of the muscle where the injection was given

2. Tiredness

Occurs to more than 1 of 10 vaccinated people

You might feel tired for up to three days after you took the vaccine. Some doctors say that this happens because your body is creating new antibodies and is normal for some people to fell tired.

3. Headache

Occurs to more than 1 of 10 vaccinated people

13% of patients between ages 18 to 55 had a bad headache after the first dose. For moderna vaccine, the rate is 16%.

4. Muscle Pain

Occurs to more than 1 of 10 vaccinated people

Shoulder pain after a vaccine injection is common, and almost always pain that does occur resolves within a day or two. Applying ice on the area will help reduce the pain.

5. Chills

Occurs to more than 1 of 10 vaccinated people

This is also a common side effects of most vaccines, so is nothing to worry about. Is reported on both Moderna and Pfizer.

6. Joint Pain

Occurs to more than 1 of 10 vaccinated people

This is more common on Moderna than on Pfizer Vaccine. According to, “More than 44% of people who received the vaccine reported experiencing joint pain”.

7. Fever (above 37.8°C)

Occurs to more than 1 of 10 vaccinated people

It’s quite common to develop a fever after a vaccination. This normally happens within 48 hours of the vaccination and usually goes away within 48 hours.

You do not need to self-isolate and book a test unless you have other coronavirus symptoms, or:

  • you have been told by NHS Test and Protect that you are a close contact of someone who has tested positive for coronavirus
  • you live with someone who has recently tested positive
  • you live with someone who has symptoms

8. Nausea, Injection Site Swelling or redness

Occurs to 1 of 10 vaccinated people

This is a normal body reaction to vaccines. this side effect usually occurs in less than 15 minutes, according to Pfizer and Moderna recommendations you need to stay under the observation of a person with medical studies for 15 minutes after you took the anti-COVID Vaccine.

9. Enlarged lymph nodes, Felling Unwell

Occurs to 1 of 100 vaccinated people

Even though is unlikely for a healthy person to have this side effect if you do have it, you need to contact a doctor.

10 .Temporary one sided facial drooping

Might occur to 1 of 1000 vaccinated people – This might not be 100% accurate.

This happened in the US, at the date of this article, to 4 people who took Pfizer Vaccine and to 3 that took Moderna`s vaccine.

Dr. Anthony Geraci, Northwell Health’s Director of Neuromuscular Medicine in Great Neck, New York, says at least two Bell’s palsy patients visit his office a month, and they always recover within several weeks.