Swallowing: Caregivers' Guide to Swallowing Disorders Download English PDF, 2.95MB, PDF Download Chinese PDF, 1.82MB, PDF Swallowing is a complex activity that requires precise control and coordination of the muscles of the mouth, throat and esophagus.A swallowing disorder, also known as dysphagia, refers to any difficulty in the process of swallowing. If you have dysphagia, you may experience difficulty in chewing food or transporting food or fluids from the mouth to the stomach.Dysphagia can be caused by many medical conditions, including stroke, head injury, dementia, Parkinson's disease, motor neuron disease, head and neck cancer, and respiratory diseases.It is important to detect dysphagia early so that right assessment and management can be introduced. [Please download the PDF file if you are unable to view the image below.]