Difficulty Swallowing (Dysphagia)

Dysphagia is the medical term for difficulty swallowing – the sensation that food, liquid, or saliva is not moving normally from the mouth to the stomach. It can manifest as difficulty initiating a swallow, the sensation of food sticking in the throat or chest, coughing or choking during eating or drinking, or the need to make multiple swallowing attempts to clear a single mouthful.

Normal swallowing is a complex, precisely coordinated sequence involving the oral cavity, pharynx, larynx, and esophagus. It depends on the intact function of more than 25 pairs of muscles and multiple cranial nerves. Disruption of any component – structural, muscular, or neurological – can cause dysphagia.

Dysphagia is broadly classified by location:

• Oropharyngeal dysphagia: Difficulty in the mouth, throat, or upper esophagus; often causes immediate coughing, choking, nasal regurgitation, or a sensation of sticking in the throat; commonly caused by neurological or structural disorders of the head and neck
• Esophageal dysphagia: Difficulty further down, with a sensation of sticking in the chest; more often caused by esophageal structural abnormalities or motility disorders

Head and neck cancer and its treatment

Malignant tumors of the oral cavity, oropharynx, hypopharynx, and larynx may impair swallowing by directly obstructing the pharyngeal lumen, infiltrating the swallowing musculature, or compressing neural structures. Treatment-related dysphagia – from surgery that alters oral or pharyngeal anatomy, or from radiation-induced fibrosis and xerostomia (dry mouth) – is among the most functionally significant long-term consequences of head and neck cancer treatment.

Structural causes

• Pharyngeal or laryngeal tumors (benign or malignant)
• Zenker's diverticulum (a pharyngoesophageal pouch that traps food and causes regurgitation of undigested material)
• Laryngeal edema or abscess
• Cervical osteophytes (bone spurs) compressing the pharynx
• Post-cricoid webs (thin mucosal folds in the hypopharynx)
  
  

Neurological causes

• Stroke (the most common cause of oropharyngeal dysphagia)
• Parkinson's disease
• Motor neuron disease (ALS)
• Multiple sclerosis
• Traumatic brain injury
• Vocal fold paralysis (impaired laryngeal closure causes aspiration)
  
  

Post-surgical causes

• Dysphagia is common after major head and neck cancer surgery, particularly procedures involving the tongue, floor of mouth, oropharynx, or larynx. The degree of impairment depends on the extent of resection and the quality of reconstruction.

Radiation-induced dysphagia

• Radiation therapy to the head and neck causes progressive fibrosis of the pharyngeal and laryngeal muscles over time. This can result in gradually worsening dysphagia months to years after completing treatment – a phenomenon sometimes referred to as late-onset radiation-associated dysphagia (late RAD).

Aspiration

• A critical complication of oropharyngeal dysphagia is aspiration – the entry of food, liquid, or secretions into the airway below the vocal folds. Aspiration can lead to aspiration pneumonia and, in severe cases, significant nutritional compromise requiring enteral feeding support.

See a physician if:

• Swallowing difficulty persists for more than two weeks or is progressive
• There is a sensation of food sticking in the throat or chest
• Swallowing causes pain (odynophagia)
• Coughing, choking, or food/liquid coming out of the nose occurs regularly during meals
• Voice quality changes after eating or drinking (a "wet" or gurgly voice may indicate food pooling above the airway)
• Unexplained weight loss accompanies swallowing difficulty
• Swallowing difficulty is accompanied by hoarseness, a neck lump, or persistent sore throat

Seek urgent or emergency evaluation if:

• Swallowing difficulty causes respiratory distress or the sensation of complete obstruction
• Food or a foreign body is believed to be lodged in the throat
• Dysphagia is accompanied by rapid neck swelling, fever, or signs of deep-space infection

Dysphagia associated with a neck mass, hoarseness, or unexplained weight loss in an adult — particularly a smoker or heavy drinker over 40 — requires prompt evaluation by an otolaryngologist or head and neck specialist to exclude malignancy.