For both the Moderna and Pfizer COVID vaccine, the FDA says there is a “remote chance” that the vaccine could cause a severe allergic reaction, otherwise known as anaphylaxis. If that happens, you need to call 911 or go to the nearest hospital, per the FDA. Normal side effects, on the other hand, do not usually require further action, but if they “bother you or do not go away,” the FDA says you should call your vaccination or healthcare provider. And for more vaccine reactions to be aware of, Dr. Fauci Says He Had These Side Effects From His Second Vaccine Dose.ae0fcc31ae342fd3a1346ebb1f342fcb A severe allergic reaction to the COVID vaccine can produce multiple symptoms. According to the FDA, you may experience difficulty breathing, swelling of your face and throat, a fast heartbeat, a bad rash all over your body, dizziness, and weakness. The administration says that for both the Moderna and Pfizer vaccine, you should expect a severe allergic reaction to occur “within a few minutes to one hour after getting a dose.” The CDC recommends that anyone with a history of anaphylaxis be monitored for 30 minutes after getting the vaccine, and that everyone else be monitored for at least 15 minutes—ideally reducing the number of severe allergic reactions that occur outside of healthcare settings. And for more up-to-date information, sign up for our daily newsletter. The CDC says that anaphylaxis can also result in gastrointestinal symptoms, such as nausea, vomiting, diarrhea, and abdominal pain. These symptoms in particular may mean your reaction is getting even worse, prompting an even more immediate need for an emergency room visit. According to healthcare services site Ada, stomach cramps, nausea, and vomiting are symptoms that appear as “anaphylaxis rapidly progresses to its more severe form, anaphylactic shock.” And for more reasons you might need emergency care, If You Have One of These Symptoms, the CDC Says Go to the Hospital Now. While health officials want to make sure you’re aware of the possibility of experiencing a severe allergic reaction after vaccination, they’re doing so out of an abundance of caution. After all, the CDC has reported that anaphylaxis after the COVID vaccine is a very rare event: According to a Jan. 6 report from the agency, only 21 cases of anaphylaxis were reported after more than 1.8 million Pfizer vaccine doses were given, with 71 percent occurring within 15 minutes of vaccination. As for Moderna’s vaccine, a Jan. 22 report from the CDC identified only 10 cases of anaphylaxis after more than 4 million doses were administered, with nine of these cases occurring within 15 minutes. And for more reported vaccine reactions, Tyler Perry Said He Had These Side Effects From the COVID Vaccine. Both vaccines currently available in the U.S. require two doses, and while health officials tout the importance of getting both doses, the FDA says severe allergic reactions negate that. If you experience anaphylaxis after getting either the Moderna or Pfizer vaccine, you should not get a second dose of the vaccine, per the FDA. And for more on the future of the pandemic, Dr. Fauci Says You Should Be Able to Do This One Thing by April.