Knee injuries generally do not cause sciatica. Sciatica can be caused by lumbar disc herniation, sciatic neuritis, etc. It can be improved by exercise, medication, physical therapy, surgery, etc. 1. Lumbar disc herniation: When the lumbar disc structure undergoes hyperplasia and other changes, it will press on the sciatic nerve around the spine and cause pain symptoms. In order to reduce sciatica, pay attention to the lumbar warmth, avoid bending activities, pay attention to rest. Anti-inflammatory drugs such as ibuprofen can be taken. Magnetic therapy and microwave therapy can also be performed to promote the absorption of local inflammatory substances and reduce pain. Straight leg raising, cycling and other exercises can also be carried out to reduce the pressure on the lumbar spine and relieve pain. 2. Sciatic neuritis: When edema, hyperplasia and other aseptic inflammation occur in the sciatic nerve, it will cause obvious pain. In order to reduce the pain, heat therapy and infrared laser therapy can be used to promote local blood circulation and improve the inflammatory response. Vitamin B and other drugs can also be taken under the guidance of the doctor to nourish the nerves and reduce the inflammatory reaction of the nerves to relieve pain. If conservative treatment is ineffective, surgical treatment is needed. If obvious symptoms such as lower limb pain occur, it is recommended to go to the hospital as soon as possible.