Oculopharyngeal muscular dystrophy (OPMD): drooping eyelids and swallowing difficulty

The first sign is often the eyelids. They droop gradually, and people adapt without noticing by tilting the head back or lifting the brow with the forehead muscles. Family photographs from years earlier sometimes show the change. The swallowing symptoms come on slowly too: a sense of food sticking, coughing at meals, taking longer to eat, and avoiding dry or bulky foods.

MedlinePlus lists drooping eyelids that can worsen and impair vision, difficulty swallowing that begins with dry foods and may progress to liquids, weakness in shoulder, upper leg and hip muscles, and tongue weakness and wasting. Because these changes arrive in middle age, they can be mistaken for ageing, thyroid disease or myasthenia gravis.

Several treatable conditions look similar early on. Myasthenia gravis also causes ptosis and swallowing trouble, but weakness fluctuates through the day and responds to specific treatment. Thyroid eye disease, stroke, motor neurone disease and mitochondrial myopathies can all produce overlapping symptoms. Careful clinical assessment, with specific blood tests and electrical studies, helps tell them apart.

A key discriminator is the family history. OPMD is dominantly inherited, so a parent, aunt or grandparent often had droopy eyelids and swallowing problems, although this is sometimes remembered only as late-life frailty.

The condition arises from a small repeat expansion in the PABPN1 gene, which is involved in processing messenger RNA. The abnormal protein tends to clump in muscle cell nuclei. MedlinePlus says most cases are autosomal dominant, requiring only one altered gene copy, and some individuals inherit changes in both copies, resulting in earlier onset and greater severity.

Genetic testing of PABPN1 confirms the diagnosis and avoids the need for a biopsy in most patients. NHS genetic testing is free when arranged by a hospital specialist, and counselling is offered alongside it, which is especially relevant because adult children of an affected person may be considering their own testing.

Swallowing is the most important health issue because it affects nutrition and the chest. A speech and language therapist assesses swallowing and may arrange a videofluoroscopy, where X-rays show barium passing through the throat, or an endoscopic swallow study. Advice often includes modified food textures, head positioning and swallow manoeuvres, and eating small amounts slowly.

When the upper oesophageal sphincter fails to relax, some patients benefit from a procedure called cricopharyngeal myotomy, which cuts the muscle to ease passage of food. It is a specialist decision and is not suited to everyone. Unintended weight loss, repeated chest infections or choking episodes should prompt urgent review, and choking that cannot be cleared is an emergency requiring 999.

When drooping impairs vision, oculoplastic surgeons can lift the lids using surgery that shortens or suspends the eyelid muscle. Because the muscles that close the eyes may also be weak, surgeons take care to avoid dry-eye complications. Lubricants and monitoring are used after surgery.

Leg weakness develops gradually and can cause difficulty with stairs and rising from low seats. Physiotherapy, walking aids and home adaptations support independence. In severe forms, MedlinePlus notes that cognitive decline, neuropathy and psychiatric symptoms may occur.