Why some people feel terrible after a Covid shot

That headache may be a sign that it's working.

View in browser|nytimes.com Continue reading the main story October 14, 2023 A new study has an encouraging message for people who shy away from Covid shots because of worries about side effects. Caroline Brehman/EPA, via Shutterstock That post-vaccination headache may be a sign that it's working. → Sign up for the Well newsletter, for Times subscribers only. Essential news and guidance to live your healthiest life. Get it in your inbox Continue reading the main story ADVERTISEMENT Continue reading the main story Need help? Review our newsletter help page or contact us for assistance. You received this message because you signed up for updates from The New York Times. To stop receiving From The Times, unsubscribe. To opt out of other promotional emails from The Times, including those regarding The Athletic, manage your email settings. To opt out of updates and offers sent from The Athletic, submit a request. Subscribe to The TimesGet The New York Times app Connect with us on: Change Your EmailPrivacy PolicyContact UsCalifornia Notices The New York Times Company. 620 Eighth Avenue New York, NY 10018