Articles and social media posts online have shared the statistic that 86% of children in a COVID-19 vaccine trial suffered an adverse reaction, often without giving further details. While the ...

Some people experience shoulder pain after receiving the COVID-19 vaccine. Vaccinations of all types can cause redness, swelling, and pain. These are normal reactions to vaccinations. They are part of ...

Some patients with rheumatic heart disease who are thought to have an allergic response to injectable penicillin may actually be experiencing a cardiac reaction to the injection, new information ...

Twinrix (hepatitis A and hepatitis B [recombinant] vaccine) can cause side effects that range from mild to serious. More common side effects include injection site soreness and headache. Talk with ...