Loss of voice, due to a cold or singing too much

So you have lost your voice due to overuse through singing or from a severe cough during a cold – You can recover and take treatment in the otological hospital or just rest your throat. Your throat is then better, and almost back to normal, but for some reason you cannot sing or speak like before.
Some people cannot recover completely when they lose their voice. After the voice returns it sounds different than before, it is harder to let out a high pitch, or still sounds hoarse. Why?
It is because the muscles have been strained and cannot go back to their original state before the damage from overuse or severe coughing was done. This issue is consistent with the intrinsic laryngeal muscle, including the vocal chords and the extrinsic laryngeal muscle used for phonation. The intrinsic laryngeal muscles are responsible for controlling sound production. Whereas the extrinsic laryngeal muscles support and position the larynx within the trachea.
If you have lost your voice due to a cold or singing too much, you do not only do damage to the intrinsic laryngeal muscle, but also the extrinsic laryngeal muscle.
I’ll show you an example of what to expect from the cases I have seen:

In the case of sing or cough too long
◆People who do not have LDP:
●This issue can be recognized visually by observing a fine scratch that’s located on the membrane of the posterior cricoarytenoid muscle and the lateral cricoarytenoid muscle. A metabolic disturbance of the cricothyroid muscle and also, mild inflammation (myofascitis or laryngitis).

◆People who have LDP:
●In addition to the above symptoms, you would observe another fine scratch on the membrane of the omohyoid muscle, the sternohyoid muscle and the thyrohyoid muscle.

In the case of a loud cough or voice
◆People who do not have LDP:
●The fascia of the stylopharyngeus muscle and the stylohyoid muscle ruptures
●The laryngx twists due to an imbalance between the left and right muscles.

◆People who have LDP:
●In addition to the above symptoms, damage of the pharyngeal constrictors can be observed (this symptom is caused by the outer edge of the thyroid cartilage and the front cervical spine applying pressure to the pharyngeal constrictors)
●The fascia of the omohyoid muscle,the sternohyoid muscle and the thyrohyoid muscle ruptures
●In rare cases of deformation, depending on the damage severity, the stylohyoid ligament and cricoid cartilage can tear.

The red circle is an example of a scar at the bottom of the posterior cricoarytenoid muscle.