You won't be able to eat or sing properly without feeling sore throat. When you have strep throat, you will feel pain and swelling in your throat, and you can spread the infection to others by sneezing and coughing. Be sure to bring a handkerchief when you are in a public place. Sore throat may well be accompanied (or followed) by cough and cold.
In this case, it is a bacterial or viral infection, rather than a vocal distension. As long as you feel good enough, you can sing with a sore throat. Sore throat due to a viral or bacterial infection should not last more than a few days to a week. The safest option is not to sing while you have a sore throat.
In addition to being extremely uncomfortable and risky for your performance, singing while you have an active throat infection can take its toll on your vocal cords, potentially causing damage in the long run. However, reality says that this is not always a practical option, particularly for career singers who rely on their voice for income. Singing with a sore throat may increase the likelihood of damage to the vocal cords. That's why professional singers learn to sing correctly, how to avoid the potential risks of acting with a sore throat, and the right remedies to return to action.
If possible, try to sing songs in their natural range, that don't require tons of vocal energy and are easy to sing. Let's learn more about singing with a sore throat, along with some tips and remedies to help you in your next performance. But if you don't have an infection and you don't sing every day all day, the sore throat is likely the result of singing with poor technique. And singing with this congestion forces you to use a different singing posture when you have to make your sound sit above the congestion.