What complications does collagen vascular disease cause?

Blood Pressure issue: Collagen vascular disorders makes one susceptible to high blood pressure and its consequences such as intra-uterine growth restriction, kidney & liver dysfunction, low platelet count, etc. Sometimes the disease is associated with a flare, and then side-effects due to medications used to control the underlying disease may be encountered.

Depends: Depends on location of affected organ like lungs, kidneys, intestines .. Etc