Chloe Ramirez
COVID-19 vaccines are designed to train your immune system to fight off a COVID-19 infection. While the vaccines are generally safe, they can cause side effects such as pain at the injection site, muscle aches, tiredness, and fever. These side effects typically last for a day or two, although injection site pain may persist for several days. Some people have reported experiencing muscle spasms after receiving a COVID-19 vaccine, which may be alleviated by increasing electrolyte intake. The severity of side effects may vary between individuals, and it is unclear whether the booster shot causes more or less discomfort than the initial vaccine dose. However, it is important to note that the 2024-2025 COVID-19 vaccine is updated to protect against newer variants and only requires one shot for most people, with boosters recommended only for specific groups.
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What You'll Learn
Pain at the injection site
There are several factors that can influence the intensity and duration of pain at the injection site. Individual factors, such as age, gender, and underlying health conditions, may play a role. Additionally, the specific vaccine type and brand can also impact the level of pain experienced. For example, mRNA vaccines, such as those developed by Pfizer-BioNTech and Moderna, have been associated with more pronounced side effects, including injection site pain.
It is important to note that the experience of pain can vary significantly from person to person. While some individuals may only have mild soreness, others may find the pain more bothersome. Staying hydrated and ensuring adequate electrolyte intake can help alleviate muscle spasms and discomfort. Additionally, remaining relaxed during the injection can help minimize subsequent pain, as tensing up can increase the likelihood of experiencing more intense or prolonged pain.
The COVID-19 boosters, or the updated vaccines for 2024–2025, are not considered boosters in the traditional sense. They are designed to target newer variants of the virus, such as the KP.2 and JN.1 strains. These updated vaccines are formulated to provide protection against the most recent circulating strains, which have evolved since the initial vaccine rollout. While side effects from the boosters may vary, they are generally safe and recommended for most individuals.
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Muscle aches and spasms
Muscle aches are more common in older children, adolescents, and adults, and they typically become more frequent after multiple doses or boosters. In addition, the side effects of subsequent shots and boosters are usually stronger than those of the initial shot. Therefore, if you only had minor aches and pains after your first injection, you can expect more intense muscle aches after your booster shot.
The muscle aches and spasms caused by the COVID-19 vaccine or booster typically last for a few days and can be managed in several ways. It is recommended to have over-the-counter pain relievers, such as ibuprofen or acetaminophen, readily available to help alleviate muscle aches and pains. Additionally, applying an ice pack or a cold, damp towel to the injection site can provide surface-level relief. Staying hydrated by drinking plenty of liquids in the days following the vaccination is also advised.
It is important to note that while muscle aches and spasms are common side effects, they should subside within a few days. If the symptoms persist or become intolerable, it is recommended to contact your healthcare provider for further advice and treatment options.
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Tensing up during the shot
It is normal to tense up when receiving an injection, but doing so can increase the pain you experience during and after the shot. This is because tensing the muscles can lead to more pain, damage, inflammation, and discomfort. The injection also stretches the muscle fibres and triggers an immune response, causing further discomfort.
To reduce pain, it is recommended that you relax your arm or shoulder before and during the injection. Taking deep breaths and finding a distraction can help to prevent tension and reduce pain. Planning ahead and picking a date when you don't have other commitments can also help to reduce anxiety and tension. Getting the injection in your non-dominant arm can help lessen the impact of the shot on your routine, as your dominant arm won't be sore.
After the shot, gently moving your arm can help spread the vaccine more evenly and reduce pain and stiffness. Applying a cold compress to the injection site can also help reduce swelling and numb the area, providing pain relief.
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Allergic reactions
In the case of COVID-19 vaccines, the ingredient in the Pfizer vaccine that has caused concern for allergic reactions is called polyethylene glycol (PEG), also known as Macrogol. PEG is a common ingredient in medicines, and most allergic reactions caused by PEG have been associated with laxatives and certain types of steroid injections. Despite this, studies have shown that even individuals known or suspected to have a PEG allergy can be safely vaccinated with the Pfizer vaccine. There is only one reported case of anaphylaxis with the Pfizer vaccine caused by PEG in the medical literature.
Individuals with a history of anaphylaxis immediately after taking medicines containing PEG should seek specialist allergy advice before vaccination. This includes those who have experienced anaphylaxis to multiple unrelated medicines containing PEG. However, it is important to note that individuals with a history of anaphylaxis to foods, venoms, or identified medicines may still receive the COVID-19 vaccine.
For individuals with fragile immune systems, such as transplant patients, the initial vaccine doses may not provide sufficient protection against COVID-19. In such cases, a booster shot may be recommended to ensure adequate antibody levels. It is important to consult with a healthcare professional to determine the most appropriate course of action regarding vaccination and booster shots.
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Serious but rare side effects
While COVID-19 vaccines are safe and effective, as with any vaccine, there is a risk of side effects and allergic reactions, which can sometimes be severe. Serious health conditions as a result of COVID-19 vaccination are very rare.
Anaphylaxis is a rare but serious allergic reaction that can occur after any vaccination. Symptoms of anaphylaxis include wheezing, difficulty breathing, low blood pressure, or hives. Anaphylaxis occurs at a rate of approximately 5 cases per million vaccine doses administered. Myocarditis and pericarditis are also rare adverse events following COVID-19 vaccination. Myocarditis is the inflammation of the heart muscle, while pericarditis is the inflammation of the outer lining of the heart. Most patients with myocarditis or pericarditis respond well to medication and rest and recover quickly.
In addition to the above, other rare but serious side effects of the COVID-19 vaccine include shortness of breath, a red, itchy, swollen, or painful rash at the injection site, and swollen lymph nodes, which may persist for up to 10 days.
If you experience any emergency warning symptoms, such as trouble breathing, persistent chest pain or pressure, new confusion or inability to wake up, bluish lips or face, or any other severe symptoms, seek immediate medical attention by calling emergency services.
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Frequently asked questions
There is no evidence to suggest that the booster hurts more than the vaccine. However, side effects may vary from person to person.
Common side effects include pain at the injection site, muscle aches, tiredness, and fever. These side effects usually last one to three days.
It is recommended to wait about three months after recovering from COVID-19 before getting a vaccine or booster. Getting vaccinated is a safer way to build protection against COVID-19 than relying on natural immunity.
COVID-19 vaccines approved by the FDA are safe and effective. Serious health conditions as a result of the vaccination are very rare.
Health experts typically recommend boosters three to four months after your last COVID-19 shot. However, this timing may vary depending on the evolving recommendations by health organizations.
