By Dr. Laureano Giraldez-Rodriguez, MD, FACS
“Doctor, I feel like my voice gets stuck when I talk. It’s as if the words get trapped in my throat.” I’ve heard descriptions like this many times over my career, and they often point to a condition called spasmodic dysphonia. It can be deeply frustrating for the people who live with it, but there are treatment options that can significantly improve their quality of life.
What is spasmodic dysphonia?
Spasmodic dysphonia is a neurological movement disorder that belongs to the family of focal dystonias. In this condition, the muscles of the larynx go into involuntary spasms during speech, interrupting normal voice production. It’s important to understand that this isn’t a structural problem with the vocal cords, and it isn’t a psychological problem. It’s a disorder of the central nervous system that affects the motor commands sent to the larynx.
There are three main forms:
- Adductor spasmodic dysphonia: The most common form, accounting for about 80 percent of cases. Here, the spasms make the vocal cords close too tightly during speech. The voice sounds choppy, strained, and tight, as if the person were trying to talk while holding their breath.
- Abductor spasmodic dysphonia: This form is less common. The spasms make the vocal cords open at the wrong moments, resulting in a breathy, weak voice with audible air leaks.
- Mixed spasmodic dysphonia: The third form combines elements of both.
Who does it affect, and why?
Spasmodic dysphonia usually appears between the ages of 30 and 50, although it can show up at any age. It affects women more often than men. The exact cause is still being researched, but it’s believed to involve dysfunction in the basal ganglia, the brain structures that coordinate movement.
No specific trigger is known. Many patients report that their symptoms began during a period of significant stress or after an upper respiratory infection. For others, the symptoms came on gradually with no clear triggering event. It’s important to note that while stress can make the symptoms worse, it doesn’t cause the disorder.
Symptoms and how to recognize them
The hallmark of adductor spasmodic dysphonia is breaks or interruptions in the voice during connected speech. The voice sounds like it’s getting stuck, with visible and audible effort. Interestingly, these spasms are task-specific. They mainly affect conversational speech but may be absent when the person laughs, cries, sings, or whispers.
This task specificity is an important diagnostic clue. Patients often report that they can sing without a problem but struggle to hold a normal conversation. They also notice that certain sounds or word combinations trigger more spasms than others, especially vowels at the beginning of words.
The road to diagnosis
Diagnosing spasmodic dysphonia can be challenging, and unfortunately, many patients go months or years without a correct diagnosis. I’ve seen patients who were misdiagnosed with reflux, allergies, anxiety, or muscle tension dysphonia before they reached our center.
A correct diagnosis requires a comprehensive evaluation that includes:
- A detailed medical history
- A perceptual analysis of the voice during different vocal tasks
- Videolaryngostroboscopy to observe how the vocal cords behave during the spasms
- In some cases, laryngeal electromyography (EMG)
Treatment: botulinum toxin as the cornerstone
The first-line treatment for adductor spasmodic dysphonia is botulinum toxin injection, commercially known as Botox, into the adductor muscles of the larynx. Since it was first used in the 1980s, this treatment has transformed the lives of thousands of patients.
The injection is done in the office under EMG guidance. The toxin selectively weakens the muscles that are spasming, allowing the voice to flow more smoothly. Results typically start to show 2 to 5 days after the injection.
It’s normal for the voice to be breathier or weaker than usual during the first few days or weeks after the injection. This gradually improves as the effect of the toxin evens out. The period of best voice usually lasts 3 to 6 months. After that, the symptoms gradually return and a new injection is needed.
For the abductor form, treatment also involves botulinum toxin, but the injection targets the abductor muscles. This is technically more complex and requires specialized experience.
Beyond Botox
Botulinum toxin is the most effective treatment available, but it isn’t the only tool. Voice therapy with a speech-language pathologist experienced in neurological voice disorders can be a valuable complement. It helps patients get the most out of their voice and manage the periods between injections.
New options are being researched, including surgical procedures such as selective laryngeal denervation and deep brain stimulation, although these are still less established than botulinum toxin.
A message of hope
If you recognize yourself in the symptoms I’ve described, I want you to know that you’re not alone and that help is available. There’s no definitive cure for spasmodic dysphonia, but with the right treatment, the vast majority of patients see a very significant improvement in their voice and their quality of life. The first step is getting a correct diagnosis from a laryngology specialist.
