Sometimes we really should not sing - or even talk - if we want our voices to remain healthy. Two big reasons:
- When vocal cords are swollen with active infection.
Bottom line... Don't add insult to injury. After laryngitis, go on voice rest until your cords are ready!
- When the body is too tired to support and control the breath.
I was practicing some songs with my husband for our band 6Play and I found this out freshly. About half way into the songlist we usually go through, I noticed that the juice fast I was on for the day left me with an energy lag (duh!). Though I certainly know how, I could not for the life of me support my voice properly. I stopped when I noticed my voice was not liking the feeling of singing.... well before any vocal strain could set my vocal stamina back.
Bottom line... If you are physically tired, drained or even overly hungry or tight, don't sing- at least not for long! - and again, limit talking. Get some rest, food, water and recovery time before using your voice. Your vocal cords will thank you, I promise.