Tendinitis (informally also tendonitis), meaning inflammation of a tendon (the suffix -itis denotes diseases characterized by inflammation), is a type of tendinopathy often confused with the more common tendinosis, which has similar symptoms but requires different treatment. The term tendinitis should be reserved for tendon injuries that involve larger-scale acute injuries accompanied by inflammation. Generally tendinitis is referred to by the body part involved, such as Achilles tendinitis, or patellar tendinitis.