Amyloidosis

This is a group of diseases in which protein builds up in certain organs (localized amyloidosis) or throughout the body (systemic amyloidosis). 

Amyloidosis may be either primary (with no known cause), secondary (caused by another disease, including some types of cancer, such as multiple myeloma), or hereditary (passed down from parents to children). 

Many organs are affected by amyloidosis; which ones depends on whether the amyloidosis is the primary, secondary or hereditary form.