Amyloidosis refers to a group of diseases in which insoluble protein is abnormally deposited in tissues and organs, changing their structure and function.
Polymyositis is an inflammatory muscle disease which causes fever, weight loss and muscle wasting in adults. It is thought to be an autoimmune condition.
Psoriatic arthritis affects some people with psoriasis. It is a chronic inflammatory disease affecting the joints, causing painful, stiff or swollen joints.
Appendicitis is the sudden onset of inflammation of the appendix. It causes severe abdominal pain and is treated with an operation to remove the appendix.