How are they treated?
For many voice problems, resting your vocal cords is all that is needed, although this can be difficult for some people. If you have a more serious or chronic voice problem, you may need medicines, surgery, voice therapy, or a combination of these. Treatment frequently succeeds in restoring the voice to normal. But it may take some time for your voice to return to normal, depending on the severity and cause of your voice problem.
Source: http://www.webmd.com