Laryngeal muscle weakness, also known as laryngeal muscle weakness. The laryngeal muscle refers to the muscles related to vocalization such as the vocal fold closure muscle (vocalization muscle, protection muscle) including the aryepiglottis muscle, the cricoarytenoid muscle, the interarytenoid muscle, the vocal fold opening muscle (respiratory muscle) such as the cricoarytenoid muscle, and the vocal fold tension muscle (articulation muscle) such as the cricoarytenoid muscle. Laryngeal muscle weakness is a condition in which the aforementioned laryngeal muscles have low tone, i.e., insufficient tone. So what are the causes of laryngeal muscle weakness? 1. Excessive use of the voice, disease causes, and mental factors can lead to weakness of the laryngeal muscle tension. Specifically, among the laryngeal muscle weaknesses caused by excessive use of voice, “too much talking” accounts for a large proportion, which is mainly related to occupation, and the affected groups are salesmen and flight attendants. Due to the high frequency of speaking every day, the laryngeal muscles become overworked and weak over time. Improper vocalization is also a sign of excessive use of the voice, mostly in children. When children play and play, they always like to shout, which can cause strain on the laryngeal muscles and weaken the function of the laryngeal muscles, thus affecting the vocalization. 2, disease causes include three types of conditions: The first category is patients with myasthenia gravis. This group is not only weakness of the laryngeal muscles, but also weakness of other muscles in the body. The second category is gastro-laryngeal reflux. Fluid and gas from the stomach return to the larynx, which can cause hoarseness after repeatedly irritating the vocal cords. The third category is inflammatory factors such as pharyngitis and colds. This can affect the mucous membrane function of the vocal cords and the motor function of the laryngeal muscles, which can lead to weakness in speech and hoarseness over time. 3, mental factors can also affect vocalization. Studies have shown that people with long-term mental depression, bad emotions through the nerve reflexes, so that the strength and frequency of muscle movement is disturbed, which in turn increases the risk of laryngeal muscle weakness.