Do you have a good college dictionary? If you don't understand what something means, look it's definition up. This is the definition of "risk":
"the chance of injury, damage, or loss; dangerous chance; hazard; the degree of probability of loss." Webster's New World Dictionary, College Edition, The World Publishing Company, 1966.
Basically, you are wanting to list the complications, injuries, damages or losses that can occur that are related to the patient's medical diagnoses or symptoms they are having. This presumes that you understand the pathophysiology of the disease process going on underlying each of the symptoms. Again, if you don't, you need to use a pathophysiology book for reference.