Hyperlipoproteinemia type I is an inherited disorder caused by lipoprotein lipase (LPL) deficiency, which impairs the effective breakdown of triglycerides. Symptoms exhibited by affected individuals include episodes of abdominal pain, recurrent acute pancreatitis, eruptive cutaneous xanthomata and hepatosplenomegaly. Mutations in the lipoprotein lipase (LPL) gene are responsible for causing Hyperlipoproteinemia type I.