Headache is one of the most frequent symptoms that can appear after the administration of any vaccine, not only COVID-19 vaccines. Tiredness, myalgia and shivering are also common. In general, these symptoms subside in the first 24-48 hours after vaccination with or without specific treatment, so immediate consultation with a physician is not necessary.

If the headache is intense, it persists for more than 3 days, increases with movement or when lying down and does not subside with usual analgesics, or if it is accompanied by vascular lesions on the skin (petechiae, hematomas), it should be a reason for urgent consultation at the nearest health center.