The most common cause of leg shaking, also known as tremors, is neurological disorders or conditions. Other causes include certain drugs, alcohol withdrawal, liver failure, mercury poisoning and overactive thyroid. Some tremors can be inherited or idiopathic, according to MedicineNet.
A tremor is the involuntary movement of a region of the body. Tremors are characterized by a repetitive, oscillating movement or shaking. Tremors are particularly common in limbs, such as the legs, explains MedicineNet. Tremors are not dangerous by themselves but can be caused by a more serious condition. A physical exam, along with neurological tests and diagnostic imaging, can help to determine the source of the tremor. Common neurological causes of a tremor include Parkinson's disease, multiple sclerosis and stroke.
As of 2015, there is no cure for tremors. However, there are many treatments available to reduce the frequency and severity of tremors, says MedicineNet. Many medications for Parkinson's disease work effectively at treating tremors related to the condition. Beta-blockers, anticonvulsant drugs and botulinum toxin injections have also proven effective in reducing the occurrence of tremors. Tremors may be treated surgically through procedures such as deep-brain stimulation, where a small neurostimulator device is placed in the brain to help control involuntary movements.