Laryngeal muscle weakness will have symptoms such as vocal effort, hoarseness, voice interruption and loss of voice. 1. Vocal effort: it is hard to speak, the high notes can’t go up, the low notes and weak notes can’t be produced, and the speech or singing can’t last long. 2. Hoarseness: the voice is weak, feeble, or not clear when speaking, or even no voice in severe cases. 3. Voice interruption: the voice is easily interrupted when speaking, singing or practicing. 4. Loss of voice: although the patient is speaking, there is no way to make a sound. Laryngeal muscle weakness can be caused by a variety of reasons, such as autoimmune or nerve damage, resulting in weakness in pronunciation, cholinesterase inhibitors such as neostigmine can be used for short-term treatment. If you have the above symptoms, it is recommended to consult a doctor for systematic examination and diagnosis, and standardize the use of medication and treatment under the guidance of the doctor.