Does one cause the other?
Does one cause the other?

Does one cause the other?

Syncope is the medical term for fainting. It is a potential side effect of any vaccine, including those used to prevent COVID-19. Fainting is when you faint due to lack of oxygen to your brain. It is most often a vaccine side effect among younger adults and teens, according to Finnish Institute for Health and Welfarebut it can affect anyone.

In most cases, the stress and anxiety of getting a vaccine causes fainting, not the vaccine itself. In very rare cases, a severe allergic reaction to one of the ingredients may cause a drop in blood pressure leading to loss of consciousness.

Read on to learn more about why some people faint after receiving a COVID-19 vaccine and what factors make people faint.

According to Centers for Disease Control and Prevention (CDC), fainting is a reported side effect of almost every vaccine. It is most common after vaccinations against:

In most cases, fainting is caused by stress and anxiety upon receiving a vaccine. These emotions can trigger a condition called vasovagal syncope. Vasovagal syncope is most common cause of fainting in general.

Nerves send messages from your brain to your heart and blood vessels to control your heart rate and blood pressure. Vasovagal syncope occurs when these nerves do not send an appropriate signal, causing a drop in blood pressure and insufficient blood flow to your brain.

Strong emotions, such as the fear of receiving a vaccine and other factors such as dehydration or pain may trigger vasovagal syncope.

In a May 2021 report published by the CDC, the reported fainting rates from Janssen COVID-19 vaccines and influenza shots were 8.2 and 0.05 per day, respectively. 100,000 people between 2019 and 2021.

Of the people who fainted, 62 percent were aged 11 to 18. And 25 percent were aged 19 to 49.

Nearly a quarter of people who experienced fainting or other anxiety-related side effects after receiving the Janssen vaccine reported a history of similar anxiety-related events from other vaccines.

Allergic reaction

In less than 1 in 1 million peopleVaccination can trigger a severe allergic reaction called anaphylaxis. Anaphylaxis can be fatal if not treated quickly. According to the World Health Organization (WHO), it is developing normally 5 to 30 minutes after injections.

Symptoms of anaphylaxis may include:

Fear of medical procedures involving needles is called trypanophobia. It is a very common fear. In a 2018 reviewResearchers estimated that the prevalence is 20 to 50 percent in adolescents and 20 to 30 percent in young adults.

The development of phobias is complex and can be caused by a combination of social, psychological and physiological causes.

According to WHOthe development of a vaccine phobia can be explained by physiological factors such as:

  • Age. Adolescents have the highest risk of vaccine anxiety.
  • Sex. Women are more likely to experience anxiety than men.
  • Weight. Lower body weight is associated with a higher risk of fainting.

Vaccine phobia is also influenced by psychological factors, including:

  • personality
  • ability to understand and reason
  • prior knowledge of vaccination
  • underlying anxiety
  • earlier experiences

Social factors also play a role, such as:

  • trust in healthcare professionals
  • perceptions of vaccination among people in a society
  • fake and misleading news
  • friends and family experiences

In the same May 2021 report published by the CDC, the most commonly reported anxiety-related symptoms were:

More than 98 percent of fainting episodes occur inside 30 minutes of injection according to a review from 2021. After your vaccine, the person who administered the shot will probably tell you to wait at least 15 minutes for monitoring.

If you are with a person who is fainting, lay the person down with their legs in a raised position until the person is feeling better.

If you develop anxiety-related symptoms after vaccination, try taking slow, deep breaths to calm your heart rate. Staying hydrated and having a snack available can also help you relieve symptoms such as fainting or dizziness.

Many people find it helpful to distract themselves with something, such as listening to music, playing a game, or speaking.

IN two 2018 surveysResearchers found that short workouts before vaccination lowered the number of side effects.

That WHO recommends administering vaccines in a calm, planned and private environment whenever possible.

If your child is nervous about vaccines, you may be able to reduce their stress by:

  • gives children 2 years and younger something sweet before the shot to help reduce pain
  • breastfeeding babies to help soothe and relax them
  • ask the vaccine administrator to use an analgesic ointment or spray
  • explain to your child in simple terms what to expect
  • bring comforting things to your child, such as their favorite toy or blanket
  • distract your child to draw their attention away from the shot
  • to get older children to take slow, deep breaths
  • soothing infants with hugs and soothing whispers

It is common to experience mild side effects after receiving a vaccine. If side effects occur, they usually go away after 1 or 2 days.

According to CDCthe most common side effects are:

Rarely, some people may experience more severe reactions. These may include:

Many people find it stressful to get a vaccine. This stress can lead to anxiety-related side effects such as fainting, dizziness or nausea. In very rare cases, vaccines can cause a severe allergic reaction that causes fainting.

For the vast majority of people, vaccines give no or mild side effects. If you have a history of vaccine-related anxiety, talk to your doctor about ways to deal with your anxiety before a vaccine to reduce your chances of side effects.

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