Of these, more than 70% reported pain, 33% fatigue, 30% headaches, 23% muscle pain, and about 11% chills, fever, swelling or joint pain.
There was little difference in reported side effects between the two vaccines, though people generally had a harder time with the second dose than the first.
More than 9,000 people reported side effects following vaccination to the CDC's Vaccine Adverse Event Reporting System, or VAERS. Just under 1,000 of those reports were considered serious. The majority of complaints involved headaches, fatigue, dizziness, nausea, chills, fever and pain.
A third safety reporting system, called the Vaccine Safety Datalink, looks at medical records from nine participating health care organizations, including data on more than 12 million people per year. More than 162,000 people in the system have received at least one COVID-19 shot.
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