| UPDATED: 15:14, Thu, Mar 11, 2021 Link copied Sign up for FREE health tips to live a long and happy life SUBSCRIBE Invalid email When you subscribe we will use the information you provide to send you these newsletters. Sometimes they'll include recommendations for other related newsletters or services we offer. Our Privacy Notice explains more about how we use your data, and your rights. You can unsubscribe at any time. The Covid Symptom Study has seen more contributors volunteer information about their "unusual symptoms" of coronavirus, including Covid tongue, which has been mounting since January. Lead author Professor Tim Spector Tweeted: "One in five people with Covid still present with less common symptoms that don't get on the official PHE [Public Health England] list. "Seeing increasing numbers of Covid tongues and strange mouth ulcers. If you have a strange symptom or even just headache and fatigue stay at home!"