Dysphagia

Dysphagia refers to difficulty swallowing—occurring at various anatomical sites—caused by multiple underlying conditions. Dysphagia can impair food intake and nutrient absorption, and may lead to aspiration of food into the trachea, resulting in aspiration pneumonia; in severe cases, it can even be life-threatening. Identifying and treating the underlying disease causing dysphagia is essential. So, what exactly is dysphagia? Below, we provide a detailed explanation.

Dysphagia

Swallowing is the process by which food is taken orally from the external environment and transported through the esophagus to the stomach—a one of the most complex human behaviors. Dysphagia is a clinical manifestation characterized by an inability to safely and effectively transport food from the mouth to the stomach due to structural or functional impairment of organs involved in swallowing—including the mandible, lips, tongue, soft palate, pharynx, and esophagus. Patients with dysphagia often tolerate only liquid or semi-liquid diets to avoid swallowing difficulties. Currently, post-stroke dysphagia is the most common and extensively studied form in clinical practice. In such cases, no anatomical abnormalities are present; rather, the disorder stems from motor dysfunction affecting the oropharynx and esophagus, typically caused by pathologies involving the central or peripheral nervous systems or muscular disorders.

Knowledge Extension: Diseases Associated with Dysphagia

1. Esophageal Cancer

Progressive dysphagia is the hallmark clinical symptom of esophageal cancer. However, dysphagia does not manifest in the early stage. Early symptoms include mild sensation of obstruction when consuming large bites of solid food; retrosternal discomfort or dull pain during swallowing; and a persistent foreign-body sensation in the esophagus after swallowing. As the disease progresses to the intermediate stage, the majority of patients develop progressive dysphagia, often accompanied by vomiting, chest or back pain, and weight loss.

2. Cardiac Gastric Cancer (Gastroesophageal Junction Adenocarcinoma)

Cardiac gastric cancer originates in—or predominantly involves—the area within 2 cm below the gastroesophageal mucosal junction. Its predominant histological type is adenocarcinoma. Clinically, its presentation, diagnostic approach, and surgical management principles closely resemble those of esophageal cancer, except that progressive dysphagia appears later in the disease course, and pain or discomfort is typically localized to the epigastric region or subxiphoid area.

The above provides an overview of dysphagia. We hope this information is helpful to you.