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Why does the HPV vaccine make you faint?

Author

David Richardson

Updated on March 09, 2026

Why does the HPV vaccine make you faint?

Officials at Merck & Co., which makes the vaccine, acknowledge the sting. They attribute it partly to the virus-like particles in the shot. Pre-marketing studies showed more reports of pain from Gardasil than from dummy shots, and patients reported more pain when given shots with more of the particles.

Just so, why do people faint after HPV vaccine?

Fainting can happen after many types of vaccinations.Fainting can be triggered by many types of medical procedures. In fact, CDC has received reports of people fainting after nearly all vaccines. Fainting after getting a vaccine is most commonly reported after three vaccines given to adolescents: HPV, MCV4, and Tdap.

Secondly, what are the side effects of having the HPV vaccine? Common side effects of HPV vaccine:

  • Pain, redness, or swelling in the arm where the shot was given.
  • Fever.
  • Headache or feeling tired.
  • Nausea.
  • Muscle or joint pain.

Beside this, why do I faint after getting a shot?

A majority of needle-phobes have a parent, sibling or child with the condition, and many have inherited what's called a vasovagal reflex in response to fear. When they see a needle or get a shot, this triggers the vagus nerve, which widens blood vessels, slows heart rate, and drops blood pressure.

Can the HPV shot make you sick?

Common side effectsMore than 1 in 100 people, but less than 1 in 10, who have the Gardasil HPV vaccine experience: bruising or itching at the site of the injection. a high temperature or feeling hot and shivery. feeling sick (nausea)

How can I prevent fainting after injection?

However, many falls due to fainting can be prevented by having the patient sit or lie down. For this reason, experts recommend having patients sit in a chair or lay down when they receive a vaccination. In addition, patients should be observed for 15 minutes after vaccination.

How can syncope be prevented?

To prevent fainting, stay out of hot places and don't stand for long periods. If you feel lightheaded, nauseous, or sweaty, lie down right away and raise your legs. Most people with occasional vasovagal syncope need to make only lifestyle changes such as drinking more fluids and eating more salt.

Why do I convulse when fainting?

Vasovagal syncope or fainting usually occurs while standing but can occur while seated. During fainting, “seizure-like” activity may occur. This shaking or stiffening is thought to be distinct from a true seizure and is due to the brain being briefly deprived of oxygen and blood flow.

Is Gardasil 9 Safe?

Yes. The safety of HPV vaccine has been well studied. All three HPV vaccines went through years of extensive safety testing before it was licensed by the FDA, which only licenses a vaccine if it is safe, effective, and the benefits outweigh any risks. Gardasil 9 was studied in more than 15,000 women and men.

Can Gardasil cause seizures?

This includes the CDC's VSD which incorporates eight large Managed Care Organizations, and now has health records linked to over 450,000 doses of Gardasil, and focuses on several potential risks: thrombotic events (blood clots), seizures, syncope, appendicitis, anaphylaxis, and GBS.

Can flu shots faint?

You may experience dizziness or fainting with the flu shot. These effects shouldn't last longer than a day or two. If you tend to get dizzy or faint when getting a shot, be sure to tell your healthcare provider before they give you the flu shot.

Why do I almost pass out when I get blood drawn?

Fainting when having blood drawn is very common. These are caused by the sight of blood, an injection, standing up for too long, or other triggers that stimulate the vagus nerve. It slows the heart rate and causes blood vessels to dilate. The sudden drop in blood pressure means not enough blood gets to the brain.

Why does my arm feel heavy after vaccination?

If you have ever received a vaccination, you know your arm may feel a bit sore for a few days after the fact. The pain you are experiencing is usually soreness of the muscle where the injection was given. This pain is also a sign that your immune system is making antibodies in response to the viruses in the vaccine.

Can you die of fainting?

Fainting, or syncope, is a sudden and temporary loss of consciousness. This usually occurs due to a lack of oxygen reaching the brain. Many things can cause oxygen deprivation to the brain, including low blood pressure. Fainting is not usually serious.

What to do after fainting?

Position the person on his or her back.
If there are no injuries and the person is breathing, raise the person's legs above heart level — about 12 inches (30 centimeters) — if possible. Loosen belts, collars or other constrictive clothing. To reduce the chance of fainting again, don't get the person up too quickly.

How long does a faint last?

The lack of blood to the brain causes loss of consciousness. Most fainting will pass quickly and won't be serious. Usually, a fainting episode will only last a few seconds, although it will make the person feel unwell and recovery may take several minutes.

What causes fainting?

Fainting can be triggered by a number of factors, including:
  • fear or other emotional trauma.
  • severe pain.
  • a sudden drop in blood pressure.
  • low blood sugar due to diabetes.
  • hyperventilation.
  • dehydration.
  • standing in one position for too long.
  • standing up too quickly.

Can you pass out from anxiety?

You may suffer from a simple fainting spell due to anxiety, fear, pain, intense emotional stress, hunger, or use of alcohol or drugs. This condition is called postural hypotension and may be severe enough to cause fainting.

How do you treat fainting?

First aid treatment for a person who has fainted includes:
  1. Help the person lie down.
  2. If the person is unconscious, roll them on their side.
  3. If possible, elevate the person's feet above the height of their head.

What does it feel like to faint?

Feeling lightheaded and weak and having the sensation of spinning are warning signs of fainting. If you notice any of these signs, sit and put your head between your knees to help get blood to your brain. You could also lie down to avoid injury due to falling. Don't stand up until you feel better.

Can anxiety cause vasovagal?

Fainting may have a variety of causes. A simple episode, also called a vasovagal attack or neurally-mediated syncope, is the most common type of fainting spell. You may suffer from a simple fainting spell due to anxiety, fear, pain, intense emotional stress, hunger, or use of alcohol or drugs.

What are the long term side effects of HPV vaccine?

The most common general adverse events in ≥ 20% of the subjects are fatigue, headache, myalgia, gastrointestinal symptoms, and arthralgia (FDA). The most frequent reported symptoms of HPV vaccination are chronic pain with paresthesia, headaches, fatigue, and orthostatic intolerance (Martínez-Lavin 2015).

Does the HPV shot mess with your period?

The menstrual cycle has no impact on the safety and effectiveness of the HPV vaccine.

Who should not receive the HPV vaccine?

Who should not get the HPV vaccine? The HPV vaccine isn't recommended for pregnant women or people who are moderately or severely ill. Tell your doctor if you have any severe allergies, including an allergy to yeast or latex.

Why does the HPV shot hurt so bad?

Whether immunization shots are given intramuscularly, intradermally or subcutaneously, they invariably sting. They also might cause some inflammation around the insertion point because “the goal of an immunization is to provoke an immune response,” says Dr.

How long does HPV vaccine last?

How long does the HPV vaccine protect for? Studies have already shown that the vaccine protects against HPV infection for at least 10 years, although experts expect protection to last for much longer.

Can you die from HPV vaccine?

Some deaths among people who received an HPV vaccine have been reported to the Vaccine Adverse Events Reporting System (VAERS). This does not mean that the vaccine caused the death, only that the death occurred after the person got the vaccine. CDC and FDA investigate all reports of death following vaccination.

How long do side effects of HPV shot last?

Very common side effects of the HPV vaccine
More than 1 in 10 people who have the Gardasil HPV vaccine experience: redness, swelling or pain at the site of the injection – the most common side effect, but it should wear off within a couple of days. headaches – but these do not usually last very long.

Should I give my daughter the HPV vaccine?

When should your child get the HPV vaccine? It is recommended for children age 11 or 12, but the vaccine can be given from ages 9 to 26. The best time for your child to get the vaccine is before he or she becomes sexually active. This is because the vaccine works best before there is any chance of infection with HPV.

What can you not do after HPV vaccine?

Because fainting can cause falls and injuries, adolescents and adults should be seated or lying down during HPV vaccination. Sitting or lying down for about 15 minutes after a vaccination can help prevent fainting and injuries.

Can I drink alcohol after HPV vaccine?

There are no known interactions between Gardasil 9 and alcohol. Talk with your doctor if you have questions about whether it's safe for you to drink alcohol before or after getting the Gardasil 9 vaccine.

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