The NHS says that other signs are heart palpitations, dizziness, joint pain, depression and anxiety and tinnitus or earaches.
The health body says other signs can include feeling sick, diarrhoea, stomach aches, loss of appetite, a high temperature, cough, headaches, sore throat, changes to sense of smell or taste, or rashes.
The British Heart Foundation (BHF) says that there is no singular test for long Covid.
The BHF says: “Make an appointment to see your doctor if you are experiencing lasting symptoms after Covid. They may refer you for tests such as blood tests and other tests, which could help to show how long Covid is affecting you and how it could be treated, or it may even be that there is another cause for your symptoms.”