Royals Queen Elizabeth Pulls Out of Jubilee Appearance After Experiencing 'Discomfort' at Trooping the Colour With "great reluctance," the Queen announced that she will not be attending the National Service of Thanksgiving at St. Paul's Cathedral on Friday By Erin Hill Erin Hill Twitter Senior News Editor, PEOPLE People Editorial Guidelines and Simon Perry Published on June 2, 2022 02:53 PM Share Tweet Pin Email Queen Elizabeth is taking a break amid her four-day Platinum Jubilee celebration after a whirlwind day of Trooping the Colour celebrations left her feeling "some discomfort," the palace announced on Thursday. The monarch said that she will not be attending the National Service of Thanksgiving in her honor at St. Paul's Cathedral on Friday. She will, however, still participate in a beacon lighting ceremony on Thursday evening. "The Queen greatly enjoyed today's Birthday Parade and Flypast but did experience some discomfort," a spokesperson for Buckingham Palace said. "Taking into account the journey and activity required to participate in tomorrow's National Service of Thanksgiving at St Paul's Cathedral, Her Majesty with great reluctance has concluded that she will not attend," the statement continued. For more on the Queen's Platinum Jubilee, listen below to our daily podcast PEOPLE Every Day. "The Queen is looking forward to participating in tonight's Beacon lighting event at Windsor Castle and would like to thank all those who made today such a memorable occasion." Anthony Harvey/Shutterstock A source tells PEOPLE that the Queen's episodic mobility issues flared during the course of the day on Thursday. She was pictured using her cane on the palace balcony as she took the salute and viewed the flypast alongside members of the royal family. Meghan Markle Charms the Royal Kids as She and Prince Harry Reunite with Royal Family: See the Photos! Queen Elizabeth. Tim Rooke/Shutterstock It's a regrettable but sensible decision based on the physical demands of tomorrow's service at St. Paul's Cathedral, the source adds. It was always the Queen's hope that she would attend rather than a firm commitment. Queen Elizabeth and Prince Louis. Aaron Chown/PA Images via Getty Images Can't get enough of PEOPLE's Royals coverage? Sign up for our free Royals newsletter to get the latest updates on Kate Middleton, Meghan Markle and more! The Queen has been experiencing mobility issues in recent months and finds it difficult to stand for long periods. She has been using a walking cane and even complained about mobility problems, joking during an in-person meeting: "Well, as you can see, I can't move!" She also recently shared a small glimpse into her battle with COVID-19 earlier this year, revealing that "it does leave one feeling very tired and exhausted." Friday's Service of Thanksgiving will be attended by several members of the royal family, including Prince Harry and Meghan Markle, who traveled from their home in California for the Platinum Jubilee.