The sciatic nerve is the most commonly affected nerve, causing symptoms of sciatica. Epidural steroid injection for sciatica and spinal stenosis is of unclear effect. Another common hernia involves the spinal discs and causes "sciatica". Diseases where leech therapy was indicated include skin diseases, sciatica, and musculoskeletal pains. For chronic sciatica, the evidence supporting spinal manipulation as treatment is poor. He suffered not only from arthritis, but also from sciatica and arteriosclerosis. Evidence does not support it being useful in sciatica or low back pain. Pain radiating down the legs (known as sciatica) may be present. This referred pain is known as "sciatica". Anticonvulsants and biologics have not been shown to improve acute or chronic sciatica. Other acute causes of sciatica include coughing, muscular hypertension, and sneezing. Ostensibly due to injuries received during military service, Lugosi developed severe, chronic sciatica. There is no one medication regimen used to treat sciatica. There is no standard treatment for pregnancy-induced sciatica. More than 75% of sciatica cases are managed without surgery.