The admission to the hospital involves the production of an admission note. The leaving of the hospital is officially termed discharge, and involves a corresponding discharge note, and sometimes an assessment process to consider ongoing needs. In the English National Health Service this may take the form of "Discharge to Assess" - where the assessment takes place after the patient has gone home.Misdiagnosis is the leading cause of medical error in outpatient facilities. When the U.S. Institute of Medicine’s groundbreaking 1999 report, To Err Is Human, found up to 98,000 hospital patients die from preventable medical errors in the U.S. each year, early efforts focused on inpatient safety. While patient safety efforts have focused on inpatient hospital settings for more than a decade, medical errors are even more likely to happen in a doctor’s office or outpatient clinic or center. Day patient
A day patient or (day-patient) is a patient who is using the full range of services of a hospital or clinic but is not expected to stay the night. The term was originally used by psychiatric hospital services using of this patient type to care for people needing support to make the transition from in-patient to out-patient care. However, the term is now also heavily used for people attending hospitals for day surgery. Alternative terminology
Because of concerns such as dignity, human rights and political correctness, the term "patient" is not always used to refer to a person receiving health care. Other terms that are sometimes used include health consumer, healthcare consumer, customer or client.
Intermittent neurogenic claudication characterized by lower limb numbness, weakness, diffuse or radicular leg pain associated with paresthesia (bilaterally), weakness and/or heaviness in buttocks radiating into lower extremities with walking or prolonged standing. Symptoms occur with extension of spine and are relieved with spine flexion. Minimal to zero symptoms when seated or supine. Radiculopathy (with or without radicular pain) neurologic condition—nerve root dysfunction causes objective signs such as weakness, loss of sensation and of reflex. Cauda equina syndrome - Lower extremity pain, weakness, numbness that may involve perineum and buttocks, associated with bladder and bowel dysfunction. Lower back pain due to degenerative disc or joint changes. Causes
Aging
Any of the factors below may cause the spaces in the spine to narrow. Spinal ligaments can thicken (ligamenta flava)
Bone spurs develop on the bone and into the spinal canal or foraminal openings
Intervertebral discs may bulge or herniate into the canal or foraminal openings
Degenerative disc disease causes narrowing of the spaces. Facet joints break down
Facet joints may hypertrophy
Compression fractures of the spine, which are common in osteoporosis
Synovial cysts form on the facet joints causing compression of the spinal sac of nerves (thecal sac)

Arthritis
Osteoarthritis
Rheumatoid arthritis—much less common cause of spinal problems

Congenital
Spinal canal is too small at birth
Structural deformities of the vertebrae may cause narrowing of the spinal canal. Instability of the spine
A vertebra slips forward on another (spondylolisthesis)

Trauma
Accidents and injuries may dislocate the spine and the spinal canal or cause burst fractures that yield fragments of bone that go through the canal.