A common vocal fault is one of pushing and pressing the tone, or some might say “driving the tone.”
This driving of the tone is accompanied by too much volume and too much weight with the pitch being either pushed down (flat) or pushed up (sharp). There will appear a harsh or steely edge to the tone, with nasality or throatiness or both. The vowels will be distorted, not pure. There will be a sense of rigidity as opposed to a flexible firmness.
Basically, the healthy balanced function of the voice is completely disturbed as a person stresses and strains. The sound might appear impressive, but it is actually dangerous as natural function is bypassed. This path is abusive and leads to vocal deterioration.
When one is used to singing in this manner, then the corrective would be to stop pushing and pressing. It is important to note that when one does so, that the voice “seems” to fall apart. The reason is that the voice has been forced to function – pushed for so long – that it literally physically does not know how to function naturally.
So, one must be led through a process with vocal exercises designed to reeducate the muscles as to their jobs. One of the first steps then is to reduce the volume (as one can) and to sing quicker exercises to encourage spontaneous movement. As the muscles do the work without being forced, there is a balance achieved between the moving muscles and the moving air plus the size and shape of the vowels. This balance gives a person a vocal sound that is both firm and flexible with a resonant quality that has carrying power without forcing.