With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Cerebral palsy is a movement disorder common in children.
text_B: Cerebral palsy -LRB- CP -RRB- is a group of permanent movement disorders that appear in early childhood .. movement disorders. movement disorders. Signs and symptoms vary among people .. Often , symptoms include poor coordination , stiff muscles , weak muscles , and tremors .. stiff muscles. spasticity. There may be problems with sensation , vision , hearing , swallowing , and speaking .. sensation. sense. vision. visual perception. hearing. hearing. swallowing. swallowing. speaking. speaking. Often babies with cerebral palsy do not roll over , sit , crawl , or walk as early as other children of their age .. Other symptoms include seizures and problems with thinking or reasoning , each of which occurs in about one third of people with CP .. seizures. seizures. thinking or reasoning. cognition. While the symptoms may get more noticeable over the first few years of life , the underlying problems do not worsen over time .. Cerebral palsy is caused by abnormal development or damage to the parts of the brain that control movement , balance , and posture .. Most often the problems occur during pregnancy ; however , they may also occur during childbirth , or shortly after birth .. Often the cause is unknown .. Risk factors include preterm birth , being a twin , certain infections during pregnancy such as toxoplasmosis or rubella , exposure to methylmercury during pregnancy , a difficult delivery , and head trauma during the first few years of life , among others .. twin. twin. preterm birth. preterm birth. toxoplasmosis. toxoplasmosis#Congenital toxoplasmosis. rubella. congenital rubella syndrome. methylmercury. methylmercury. About 2 % of cases are believed to be due to an inherited genetic cause .. inherited genetic cause. heredity. A number of sub-types are classified based on the specific problems present .. For example , those with stiff muscles have spastic cerebral palsy , those with poor coordination have ataxic cerebral palsy , and those with writhing movements have athetoid cerebral palsy .. stiff muscles. spasticity. spastic cerebral palsy. spastic cerebral palsy. ataxic cerebral palsy. ataxic cerebral palsy. athetoid cerebral palsy. athetoid cerebral palsy. Diagnosis is based on the child 's development over time .. Blood tests and medical imaging may be used to rule out other possible causes .. medical imaging. medical imaging. CP is partly preventable through immunization of the mother and efforts to prevent head injuries in children such as through improved safety .. There is no cure for CP ; however , supportive treatments , medications , and surgery may help many individuals .. This may include physical therapy , occupational therapy , and speech therapy .. speech therapy. speech therapy. physical therapy. physical therapy. Medications such as diazepam , baclofen , and botulinum toxin may help relax stiff muscles .. stiff muscles. spasticity. baclofen. baclofen. botulinum toxin. botulinum toxin. diazepam. diazepam. Surgery may include lengthening muscles and cutting overly active nerves .. Often external braces and other assistive technology are helpful .. external braces. Brace ( orthopaedic ). assistive technology. assistive technology. Some affected children can achieve near normal adult lives with appropriate treatment .. While alternative medicines are frequently used there is no evidence to support their use .. CP is the most common movement disorder in children .. It occurs in about 2.1 per 1,000 live births .. Cerebral palsy has been documented throughout history with the first known descriptions occurring in the work of Hippocrates in the 5th century BCE .. Hippocrates. Hippocrates. Extensive study of the condition began in the 19th century by William John Little , after whom spastic diplegia was called `` Little disease '' .. William John Little. William John Little. William Osler first named it `` cerebral palsy '' from the German `` zerebrale Kinderlahmung '' -LRB- cerebral child-paralysis -RRB- .. William Osler. William Osler. A number of potential treatments are being examined , including stem cell therapy .. stem cell therapy. stem cell therapy. However , more research is required to determine if it is effective and safe .
related.