Damage to the nervous system (in the brain and spinal cord) can interfere with the nerves responsible for starting and controlling swallowing.
Some neurological causes of dysphagia include:
Congenital and developmental conditions
The term "congenital" refers to something you're born with. Developmental conditions affect the way you develop.
Congenital or developmental conditions that may cause dysphagia include:
Conditions that cause an obstruction in the throat or a narrowing of the oesophagus (the tube that carries food from your mouth to the stomach) can make swallowing difficult.
Some causes of obstruction and narrowing include:
- mouth cancer or throat cancer, such as laryngeal cancer or oesophageal cancer – once these cancers are treated, the obstruction may no longer be an issue
- pharyngeal (throat) pouches – a large sack develops in the upper part of the oesophagus, which reduces the ability to swallow both liquids and solids; it's a rare condition that mainly affects older people
- eosinophilic oesophagitis – a type of white blood cell (eosinophil) builds up in the lining of the oesophagus due to a reaction to foods, allergens or acid reflux; the build-up damages the lining of the oesophagus and causes swallowing difficulties
- radiotherapy treatment – can cause scar tissue, which narrows the passageway in your throat and oesophagus
- gastro-oesophageal reflux disease (GORD) – stomach acid can cause scar tissue to develop, narrowing your oesophagus
- infections, such as tuberculosis or thrush – can lead to inflammation of the oesophagus (oesophagitis)
Any condition that affects the muscles used to push food down the oesophagus and into the stomach can cause dysphagia, although such conditions are rare.
Two muscular conditions associated with dysphagia are:
The muscles used for swallowing can become weaker with age. This may explain why dysphagia is relatively common in elderly people.
Chronic obstructive pulmonary disease (COPD) is a collection of lung conditions that make it difficult to breathe properly. Breathing difficulties can sometimes affect your ability to swallow.
Dysphagia can also sometimes develop as a complication of head or neck surgery.