Less common side-effects reported for some COVID-19 vaccines have included:

difficulty breathing
swelling of the face and throat
a fast heartbeat
a bad rash all over your body
dizziness and weakness

These serious side-effects from vaccines are extremely rare. The United States Centers for Disease Control and Prevention (CDC) advises people to be monitored for 15 minutes after vaccination, and those with a history of other allergies for 30 minutes. This allows for them to be monitored and treated immediately if they have a severe reaction.