The people included in the study suffered from headaches, tremors, muscle spasms, insomnia, sleepiness, vertigo, and difficulty in concentration.

Almost a third of individuals who received a COVID-19 vaccine suffered from neurological complications including tremors, insomnia, and muscle spasms, according to a recent study published in the journal Vaccines.

The study analyzed 19,096 people who received COVID-19 vaccines in Italy in July 2021, out of which 15,368 had taken the Pfizer vaccine, 2,077 had taken the Moderna version, and 1,651 took the AstraZeneca version.

While both Pfizer and Moderna are mRNA vaccines, AstraZeneca, being an adenovirus vaccine, uses a different mechanism to trigger the immune response.