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Common vaccine side-effects
Contact your doctor if you have:
Tips to help with vaccine side-effects
As with any medicine, it is rare but possible to have a serious reaction, such as finding it hard to breathe. It is very unlikely that this will happen. If it does, call 911 or go to the nearest emergency room.
Rare blood clots and low platelets
Blood clots involving blood vessels in the brain, abdomen, and legs along with low levels of platelets (blood cells that help your body stop bleeding), have occurred in some people who have received the Johnson & Johnson/Janssen COVID-19 Vaccine. In people who developed these blood clots and low levels of platelets, symptoms began approximately one to two-weeks following vaccination. Most people who developed these blood clots and low levels of platelets were females ages 18 through 49 years. The chance of having this occur is extremely unlikely.
You should seek medical attention right away if you have any of the following symptoms after receiving the Johnson & Johnson Vaccine:
Myocarditis & Pericarditis
There have been reports of inflammation of the heart muscle (myocarditis) or outer lining of the heart (pericarditis) in some people who got the Pfizer or Moderna vaccine. These reports are rare, and the risk of this happening is very low. Most of the cases were in male adolescents and young adults age 16 years or older and typically within several days after the second dose of the vaccine.
Seek medical help right away if you have any of the following symptoms after receiving the Pfizer or Moderna Vaccine:
Most patients with myocarditis and pericarditis who received care improved with medicine and rest and felt better quickly. Those who experience these conditions can usually return to their normal daily activities after their symptoms improve, and they should speak with their doctor about return to exercise or sports.
For more information, visit the CDC webpage Myocarditis and Pericarditis Following mRNA COVID-19 Vaccination.
Guillain Barré Syndrome
There have been reports of Guillain Barré syndrome in some people who got the Johnson & Johnson (Janssen) COVID-19 Vaccine. Guillain Barré syndrome is a nervous system disorder in which the body’s immune system damages nerve cells, causing muscle weakness and sometimes paralysis. In most of these people, symptoms began within 42 days of getting the vaccine. The chance of this happening is very low.
Seek medical attention right away if you develop any of the following symptoms after receiving the Johnson & Johnson Vaccine:
It is important to continue to take all prevention steps to protect yourself and others until you are fully vaccinated.
You are considered fully vaccinated:
If it has been less than 2 weeks after your final and/or only dose, then you do not yet have enough protection from the COVID-19 virus to safely stop any prevention steps.
Visit the When You've Been Fully Vaccinated webpage to learn about things that fully vaccinated people can (and can’t) do.
Additional doses for people with weakened immune systems (immunocompromised):
If you have a health condition or are taking medications that moderately or severely weaken your immune system (such as treatment for cancer, organ transplants or rheumatological conditions), vaccination may not be as effective.
Help CDC learn more about the safety of COVID-19 vaccines. Use your smart phone to tell CDC about any side effects after getting the COVID-19 vaccine. You’ll also get reminders if you need a second vaccine dose.
Sign up at vsafe.cdc.gov
During the first week after you get your vaccine, v-safe will send you a text message each day to ask how you are doing. Then you will get check-in messages once a week for up to 5 weeks. You’ll also receive check-ins 3, 6, and 12 months after your final dose of vaccine. If you report certain symptoms, someone from CDC may call to check on you. Learn more about v-safe.
If you have an adverse event (possible side effect) after you are vaccinated, even if you aren't sure that the vaccine caused it, please report it to VAERS. The Vaccine Adverse Event Reporting System is an early warning system that the FDA and CDC use to detect possible safety problems. To make a report, call 1-800-822-7967 or visit https://vaers.hhs.gov/reportevent.html. Please note that VAERS does not provide medical advice.