Common signs: Preschool

• May talk later than most children
• May have difficulty pronouncing words, i.e., busgetti for spaghetti, mawn lower for lawn mower
• May be slow to add new vocabulary words
• May be unable to recall the right word
• May have difficulty with rhyming
• May have trouble learning the alphabet, numbers, days of the week, colors, shapes, how to spell and write his or her name
• May have difficulty interacting with peers
• May be unable to follow multi-step directions or routines
• Fine motor skills may develop more slowly than in other children
• May have difficulty telling/or retelling a story in the correct sequence

Common signs: Kindergarten through fourth grade

• Has difficulty decoding single words (reading single words in isolation)
• May be slow to learn the connection between letters and sounds
• May confuse small words - at/to, said/and, does/goes
• Makes consistent reading and spelling errors​​
• May transpose number sequences and confuse arithmetic signs (+-X/=)
• May have trouble remembering facts
• May be slow to learn new skills; relies heavily on memorizing without understanding
• May be impulsive and prone to accidents
• May have difficulty planning
• Often uses an awkward pencil grip (fist, thumb hooked over fingers)
• May have trouble learning to tell time
• May have poor fine motor coordination

Difficulty with reading

• Difficulty learning to read
• Difficulty identifying or generating rhyming words or counting syllables in words (Phonological Awareness)
• Difficulty with hearing and manipulating sounds in words (Phonemic Awareness)
• Difficulty distinguishing different sounds in words (Auditory Discrimination)
• Difficulty in learning the sounds of letters
• Difficulty remembering names and or the order of letters when reading
• Reverses letters or the order of letters when reading
• Misreads or omits common little words
• "Stumbles" through longer words
• Poor reading comprehension during oral or silent reading 

Difficulty with written language

• Difficulty putting ideas on paper
• Many spelling mistakes
• May do well on weekly spelling tests, but there are many spelling mistakes in daily work
• Difficulty in proofreading

Difficulty with oral language

• Late in learning to talk
• Difficulty pronouncing words
• Difficulty acquiring vocabulary or using age appropriate grammar
• Difficulty following directions
• Confusion with before/after, right/left. and so on
• Difficulty learning the alphabet, nursery rhymes, or songs
• Difficulty understanding concepts and relationships

Taken from: http://www.readingrockets.org/dyslexia-beyond-myth