Thursday, September 30, 2021

Pfizer COVID-19 Vaccine Symptoms after Booster Shot

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In this post, I want to share with you my experience receiving my third dose of the COVID-19 vaccine. On August 23, 2021, the Pfizer covid 19 vaccine received its full FDA approval for people who are 16 and older and continues to be available under emergency use authorization (EUA) for children between 12-15 years old.


I received my booster shot around noon right after my morning clinic. The injection itself was not painful but I blocked my schedule in the afternoon and the morning after because I had a strong reaction after receiving my second dose of the vaccine. You can learn more about my experience receiving my first and second doses of covid vaccine in this post. Click here

Covid Vaccine Booster Shot Symptoms

I didn't notice any symptoms until around seven hours after receiving the injection. When I started to have some soreness in my upper left arm around the injection site. The soreness gradually increased throughout the rest of the evening but it did not get as intense as what I felt after receiving my first dose. The soreness in my arm did not radiate to my neck and I did not have trouble raising my arm, unlike my first dose.

Throughout the night I did not have a fever or chills like my second dose however I did have some trouble sleeping that night. I kept waking up every couple of hours throughout the night. When I woke up in the morning I still had some soreness around the injection site in my arm but it was not too bad.

However, I started feeling feverish in the morning and my temperature was 99.9 which is slightly elevated. I also had mild tachycardia but my o2 saturation was normal the whole time. I also had a mild headache throughout the morning and was quite tired. I was really glad I took the morning off after receiving the booster shot.

The headache and fatigue were noticeable but not severe enough for me to take Tylenol or Ibuprofen. I was able to have a full clinic in the afternoon and definitely noticed that the headache and fatigue gradually improved throughout the afternoon. By the evening, I only noticed some muscle achiness in my arms and legs but the fever and headache were gone. I had a good night of sleep the second night after receiving the vaccine.

When I woke up in the morning all of my symptoms were gone.


In summary, after my booster shot, I experienced soreness, around the injection site in my arm for about 24 hours but it was not as severe as my first dose. I had some insomnia the night after receiving the injection. I also experienced an elevated body temperature and tachycardia the morning after receiving the vaccine. But overall those symptoms were not as severe as the ones I had after my second dose. I was able to have a full clinic 24 hours after receiving the booster shot.

The fatigue and headache I experienced after the third dose was much milder compared to the second dose. All of the symptoms resolved within 36 hours after the injection. Thy physical symptoms I experienced after receiving the booster dose are expected symptoms that can occur after receiving the vaccine. They are signs that our immune system has been activated by the vaccine to produce antibodies against the SARS covi 2 virus.

The scientific term reactogenicity describes those physical symptoms that can occur after vaccination due to the inflammatory response in our body induced by the activation of our immune system by the vaccine. Those symptoms are typically normal and expected.

It is very important to remember that the covid 19 vaccine is effective to protect us against serious illness and hospitalization from the covid 19 disease. If we are exposed to the virus however it is less effective in protecting us from contracting the virus and carrying the virus. So it is still possible for vaccinated individuals to potentially spread the virus in our community.


So even after receiving the covid 19 vaccine, there are times and places we still need to wear masks to prevent the spreading of the virus. Sanitize your hands after touching anything. It is also very important to remember to discuss with your physician if you have any specific questions about your health or your eligibility to receive the covid-19 vaccine booster shot when it becomes available to you.

If you do not have any medical condition contraindicated to receiving the vaccine booster dose. I hope you will consider getting the vaccine yourself. This is how we all do our part to protect our family, friends, colleagues, and community. I hope that after reading this article you are able to find answers to some of the questions you may have about the Pfizer vaccine booster shot.

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