Pose your question to the American Speech Hearing and Language Association (ASHA) -- www.asha.org.
It may be laryngitis which is inflammation of the voice box.
This can be caused by bacterial or viral infections, mucus coating due to post nasal drip, irritation of the throat and voice box by irritants. Irritants can be anything from dust, smoke, etc.
Damage can also be caused if you suffer from acid reflux.
You may have damage to the vocal chords by over use, or by straining the vocal chords. If you do sing, then do make sure you do vocal warm ups.
The voice box needs to be looked after like any other part of your body.
Make sure that you do not shout or strain your voice. Drink plenty of fluids - have a bottle of water with you all the time and take sips frequently.
You can also get lozenges to help soothe any irritation.
If you have any other symptoms like catarrh, you may benefit from steam inhalations to loosen up any congestion. My doctor advised me to do steam inhalations to unblock my sinuses 4 times a day for a duration of 10 minutes each time. If you also have a headache and a fever it could indicate that you have an infection.
Make an appointment with your doctor to make sure there is no problems with acid reflux or a throat infection.
Hope you get it sorted out soon.