Crepitus is a symptom characterized by a crackling or grating feeling or sound under the skin, around the lungs or in
the joints. In
soft tissues, crepitus is often due to gas
, most often air, that has abnormally penetrated and infiltrated an area (for example, in the soft tissues beneath the skin).
In a joint, crepitus can indicate cartilage wear in the joint space. The term "crepitus" is derived from the Latin, meaning "a crackling sound or rattle.