Achalasia cardia is a motility disorder of the esophagus causing incomplete relaxation of the lower esophageal sphincter with increase in tone and absence of esophageal peristalsis. It is also termed as esophageal achalasia, cardio spasm, and esophageal aperistalsis. Click to read about causes of Achalasia Cardia. The common presentation of achalasia cardia is difficulty in swallowing. Cases although are mild and rarely fatal; can lead to complications if left untreated.