Disease Description (Causes and Symptoms)
- Summary of definition: Dyslexia is a form of learning disability in which reading (and related writing) ability is significantly lower than expected for a person’s intelligence and educational level. In the narrow sense, it refers to a deficit in decoding ability (the ability to convert letters into speech sounds); in the broader sense, it includes cases in which reading comprehension is also affected.
- Main causes and pathophysiology: Genetic predisposition is substantial, and dyslexia is associated with several genes related to early developmental neuronal migration and connectivity. Brain imaging studies have reported structural and functional differences in language- and reading-related areas of the left hemisphere (including the left temporoparietal region, the temporo-occipital region, and the left inferior frontal region). The central cognitive deficit is reduced phonological awareness.
- Common symptoms (summary by age):
- Early school years: Difficulty reading words other than familiar ones, errors involving final consonants and syllables, difficulty with dictation, slow handwriting and reduced legibility, and confusion about the order of sounds and letters.
- Later school years: Omissions and substitutions when reading unfamiliar words and loanwords, slow reading aloud, spelling and composition errors, and avoidance of reading.
- Adolescents and adults: Needing to read aloud in order to understand, slow reading, generally poor reading comprehension and composition skills, and persistent spelling errors.
Treatment Methods and Precautions
- Standard treatment (non-pharmacological):
- Structured, phonics-based, print-focused education centered on phonological awareness training (such as the Orton-Gillingham approach).
- Repeated and ongoing application of systematic learning programs integrating decoding, spelling, fluency, and comprehension.
- Assistive technology: text-to-speech (TTS), customized fonts and reading software, recordings, e-books, and similar tools.
- Educational accommodations: provision of reasonable accommodations at school, such as extra time, dividing assignments into smaller parts, and allowing oral instructions.
- Pharmacological treatment: There are no medications that treat dyslexia itself. However, when comorbid conditions such as ADHD are present, pharmacological treatment for those conditions may improve academic performance.
- Other management: Education for family members and teachers, and psychosocial support (managing self-esteem and emotional problems).
- Precautions and risk of complications:
- Early intervention is important for prognosis. Delayed treatment increases the risk of reduced academic and occupational achievement and emotional problems such as depression and anxiety.
- Comorbid conditions such as ADHD require diagnosis and treatment (a factor associated with a poor prognosis).
- Treatment should be long-term, continuous, and individualized.
Checklist Before an Outpatient Visit (Examples of Items to Bring and Medical History Topics)
- Items/materials to bring or submit:
- A list of currently used medications (name, dose, and time taken)
- Copies of school report cards and standardized test results (reading, language, and intelligence tests)
- Recently written handwriting and dictation samples, and a reading recording (if available)
- Details and reports of educational interventions received in the past (program name and duration)
- Vision and hearing test results (if there have been recent tests)
- Information to record when providing the medical history:
- When and what types of reading and writing problems began (time of discovery)
- Family history (whether a parent or sibling has dyslexia or a learning disability)
- Learning environment and support at school (special education, homework assistance, and so on)
- Difficulties in daily life (avoidance of reading, time required to complete homework, and so on)
- Presence or absence of sleep, attention, or behavioral problems (to assess the possibility of ADHD)
Examples of General Questions to Ask the Doctor
- "Is dyslexia truly the cause of our (the patient's) reading problems? What additional tests are needed?"
- "What educational or rehabilitation programs do you recommend? What should their duration and frequency be?"
- "Would medication be helpful? If there are comorbid conditions, how should they be managed?"
- "What types of support (accommodations and assistance) can be provided at school, and what is the application process?"
- "What is the prognosis? To what extent can improvement be expected with early intervention?"
Examples of Disease-Specific Questions
- For children (for parents/guardians): "Could you explain in detail the evaluation results showing my child's level of phonological awareness and reading speed and accuracy? What goals should be set, and what improvements can be expected within a few months?"
- For adults (for workers/students): "How can I request and document reasonable accommodations (such as extra time or alternative assignments) at work or university? What practical assistive technologies do you recommend for improving work and learning efficiency?"