According to the National Institute of Neurological Disorders and Stroke (NINDS), the sudden, involuntary jerking of a muscle or group of muscles while drifting off to sleep is called myoclonus. It is caused by sudden muscle contractions, also known as positive myoclonus, or muscle relaxation, which is referred to as negative myoclonus. Myoclonic jerks may occur alone or in sequence, in a pattern or without pattern.Know More
The NINDS explains that myoclonic twitches or jerks cannot be controlled and sometimes happen when a person tries to make a movement or in response to an external event. The simplest form of myoclonus involves a muscle twitch followed by relaxation. Jerks or “sleep starts” while falling asleep is a normal occurrence in healthy persons and does not cause difficulties. However, widespread myoclonus includes persistent, shock-like contractions in a muscle group. In some cases, it starts in a particular area of the body and spreads to muscles in other regions.
Severe cases cause distortion in movement and significantly limit a person’s ability to eat, talk or walk, says the NINDS. These types of myoclonus indicate an underlying disorder in the nerves or brain. Possible causes include head or spinal cord injury, infection, brain tumor, kidney failure, liver failure, and chemical or drug poisoning.Learn more about Human Anatomy
The muscle aches and joint pain that typically accompany a bout of mononucleosis are a product of the Epstein-Barr virus, which causes the disease, attacking the peripheral nervous system, explains the National Institute of Neurological Disorders and Stroke. Diseases of the peripheral nervous system are referred to as peripheral neuropathies.Full Answer >
Some causes of tremor are multiple sclerosis, hyperthyroidism, liver failure, stroke and traumatic brain injury, says the National Institute of Neurological Disorders and Stroke. Other causes are diseases that damage the central nervous system, such as Parkinson's disease. Certain drugs that stimulate the nervous system can cause tremor.Full Answer >
Tremors are typically caused by neurological disorders or conditions, the use of certain drugs, alcoholism, mercury poisoning, liver failure or an overactive thyroid, according to the National Institute of Neurological Disorders and Stroke. Some forms of tremor are genetic, and others have no identifiable cause.Full Answer >
The causes of leukodystrophy in children are genetic, according to the National Institute of Neurological Disorders and Stroke. Genes are responsible for the failure of the myelin sheath to insulate the white matter in the brain. There are several kinds of leukodystrophy.Full Answer >