Why would one vocal cord quit working my left is not moving.?

There are several possible reasons why your left vocal cord may have stopped working. Some of the most common causes include:

- Laryngeal nerve damage: The laryngeal nerve is responsible for controlling the movement of the vocal cords. Damage to this nerve can occur as a result of trauma, such as a car accident or intubation, or due to medical conditions such as diabetes or multiple sclerosis.

- Vocal cord paralysis: Vocal cord paralysis occurs when the muscles that control the vocal cords are unable to move. This can be caused by nerve damage, but it can also be caused by other factors, such as infection or thyroid problems.

- Thyroid problems: The thyroid gland is located in the neck, and it plays a role in regulating many bodily functions, including vocal cord movement. Problems with the thyroid, such as an overactive thyroid (hyperthyroidism) or an underactive thyroid (hypothyroidism), can affect the movement of the vocal cords.

- Neurological disorders: Neurological disorders that affect the nervous system can also affect the movement of the vocal cords. Some examples of neurological disorders that can cause vocal cord problems include Parkinson's disease, multiple sclerosis, and amyotrophic lateral sclerosis (ALS).

If you have experienced sudden-onset hoarseness that persists for more than two weeks, or if you have other symptoms such as difficulty breathing, swallowing, or coughing, it is important to see a doctor for evaluation. Early diagnosis and treatment of the underlying cause of vocal cord problems can help to improve the chances of recovery.