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In page Systemic scleroderma:

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Scleroderma can decrease motility anywhere in the gastrointestinal tract.[6] The most common source of decreased motility is the esophagus and the lower esophageal sphincter, leading to dysphagia and chest pain. As scleroderma progresses, esophageal involvement from abnormalities in decreased motility may worsen due to progressive fibrosis (scarring). If this is left untreated, acid from the stomach can back up into the esophagus, causing esophagitis and gastroesophageal reflux disease. Further scarring from acid damage to the lower esophagus many times leads to the development of fibrotic narrowing, also known as strictures, which can be treated by dilatation[citation needed].