Dysgraphia is a specific learning disability that causes problems with written expression. Students with dysgraphia may struggle with tasks such as holding a pen or pencil, writing letters clearly, spacing letters and words on a page, or maintaining consistency in the size, shape, and slant of the letters they write. Dysgraphia can also involve difficulty with composing written texts, thinking and writing at the same time, and spelling. Students with dysgraphia may have only impaired handwriting, only impaired spelling, or both.
(Excerpt from Reading Rockets, How Children Learn to Read and Write)