Prevalence, types and associations of medically unexplained symptoms and signs. A cross-sectional study of 1023 adults with intellectual disabilities

Background Medically unexplained symptoms and signs are common in the general population and can respond to appropriate managements. We aimed to quantify the types and prevalence of unexplained symptoms and signs experienced by adults with ID and to determine the associated factors. Method In a population-based study, 1023 adults with ID aged 16 and over had a detailed health assessment, which systematically considered symptoms and signs. Descriptive data were generated on their symptoms and signs. Backwards stepwise logistic modelling was undertaken to determine the factors independently associated with the unexplained symptoms. Results Medically unexplained symptoms and signs were present in 664 (64.9%), 3.8 times higher than in the general population, and 470 (45.9%) had multiple unexplained symptoms or signs. Some were similar to those reported in the general population, such as dyspnoea, dyspepsia, headache, nausea and dizziness. However, others are not commonly reported in the general population, including dysphagia, ataxia, polyuria, oedema and skin rash. Having unexplained symptoms and signs was independently associated with older age, female gender, not having Down syndrome, extent of ID and more GP visits in the last 12 months. It was not associated with living in deprived areas, type of living/support arrangements, number of hospital visit in the last 12 months, smoking, autism, problem behaviours or mental disorders. Conclusions People with ID have substantial additional unexplained symptoms and signs, some of which are painful or disabling. These findings should inform the content of health checks undertaken for adults with intellectual disabilities, which should not just focus on management of their long-term conditions and health promotion.