Amyloidosis – this is a condition where an abnormal protein (amyloid) builds up in different tissues and organs of the body causing various symptoms that depend on where the proteins are located. Renal Failure – This is also known as Kidney Failure, a condition where there has been severe damage to the kidneys so they are unable to function properly. Heart Failure – This is a condition where there has been severe damage to the tissues of the heart so it can no longer pump blood around the body effectively. Some symptoms include breathing problems and swollen feet.