Dysgraphia is related to dyslexia. 
It has a root in sequencing issues, particularly motor sequencing, and causes substantial writing fatigue which then contributes to poor organization on the lines and on the page and ultimately interferes with communication of ideas in writing. 
The greatest difficulty with dysgraphia is that the students may tend to simplify their writing: using smaller words and simple sentences. 
This interferes with adequate growth in written expression. 

It is possible to help students deal with dysgraphia so that this does not happen and it is strongly recommended that parents and teachers do so - even if dysgraphia is only suspected. 


Related quotes, referencing important concepts about dysgraphia

From The Source for Dyslexia & Dysgraphia (LinguiSystems):

From When Writing's a Problem (RET Center Press):

From IDA Fact Sheets (available at the web site for the International Dyslexia Association):

Informative related articles by Regina G. Richards that may be downloaded from the Inland Empire Branch of the IDA and from LD on Line .

All of the sources listed above provide recommendations for accommodations and bypass strategies.