Physical therapy or physiotherapy is a branch of rehabilitative medicine aimed at helping patients maintain, recover or improve their physical abilities. Physical therapists or physiotherapists work with patients whose movements may be undermined by aging, disease, environmental factors, or sporting hazards. Physical therapy also means the treatment of any pain, disease, or injury by physical means. The profession concerned with promotion of health, with prevention of physical disabilities, with evaluation and rehabilitation of persons disabled by pain, disease, or injury, and with treatment by physical therapeutic measures as opposed to medical, surgical, or radiologic measures.