Each column keeps its native condition scope. Initial features are displayed alphabetically, not ranked by clinical importance. Counts remain separate, and an empty cell does not mean a feature cannot occur.
"},"coverage":{"countRecords":6,"emptyColumnKeys":[],"hpoRelease":"2026-06-23","narrativeSourceChanges":[],"records":10,"sourceGroups":{"omim":4,"orphanet":0,"published":6}},"features":[{"hpoId":"HP:0012185","label":"Constrictive median neuropathy","primary":false},{"hpoId":"HP:0012276","label":"Digital flexor tenosynovitis","primary":false},{"hpoId":"HP:0046505","label":"Hand pain","primary":false},{"hpoId":"HP:0033660","label":"Hand paresthesia","primary":false},{"hpoId":"HP:0009830","label":"Peripheral neuropathy","primary":false},{"hpoId":"HP:0033672","label":"Positive carpal Tinel sign","primary":false},{"hpoId":"HP:0033673","label":"Positive Phalen test","primary":false},{"hpoId":"HP:0008326","label":"Reduced circulating vitamin B6 circulating","primary":false},{"hpoId":"HP:0003393","label":"Thenar muscle atrophy","primary":false}],"ledeHtml":"Carpal tunnel syndrome is a disorder caused by disturbances in nerve function (neuropathy), leading to pain and numbness or tingling (paresthesia) primarily in the wrist and hand. While carpal tunnel syndrome can occur at any age, it most often affects people between the ages of 40 and 60. In more than half of cases, both hands are affected; however, the severity may vary between hands. When only one hand is affected, it is most often the hand used for writing (the dominant hand).","mondoId":"MONDO:0007275","records":[{"frequencyKind":"reported","key":"0072771fb99745602f00ad9a8e70c3ef90a91b00a1dd6af100d6c0803ada7ec7","raw":{"aspect":"P","body_system":"metabolic","disease_id":"OMIM:115430","disease_name":"Carpal tunnel syndrome","evidence":"IEA","frequency_raw":null,"hpo_id":"HP:0008326","is_excluded":false,"label":"Reduced circulating vitamin B6 circulating","onset_id":null,"reference":"OMIM:115430","source_release":"2026-06-23"},"sourceGroups":["omim"]},{"frequencyKind":"count","key":"2cbec5704d465a1d6171da759c164181e0e5f5e9cb584967951abb1cbb1950fe","raw":{"aspect":"P","body_system":"musculoskeletal","disease_id":"OMIM:619161","disease_name":"Carpal tunnel syndrome 2","evidence":"PCS","frequency_raw":"13/14","hpo_id":"HP:0046505","is_excluded":false,"label":"Hand pain","onset_id":null,"reference":"PMID:32686688","source_release":"2026-06-23"},"sourceGroups":["published"]},{"frequencyKind":"count","key":"4f7987a34621afff098b79dbed7763d6759fb5fad8aa821629a1d7e9ddda5d34","raw":{"aspect":"P","body_system":"nervous_system","disease_id":"OMIM:619161","disease_name":"Carpal tunnel syndrome 2","evidence":"PCS","frequency_raw":"13/14","hpo_id":"HP:0033672","is_excluded":false,"label":"Positive carpal Tinel sign","onset_id":null,"reference":"PMID:32686688","source_release":"2026-06-23"},"sourceGroups":["published"]},{"frequencyKind":"count","key":"530ab8bd2fa049c0b26d3cd7d40169e3b7495594720570f0c1f28fa7566360e9","raw":{"aspect":"P","body_system":"nervous_system","disease_id":"OMIM:619161","disease_name":"Carpal tunnel syndrome 2","evidence":"PCS","frequency_raw":"14/14","hpo_id":"HP:0033673","is_excluded":false,"label":"Positive Phalen test","onset_id":null,"reference":"PMID:32686688","source_release":"2026-06-23"},"sourceGroups":["published"]},{"frequencyKind":"count","key":"639bed88ad9d237099988bb1712db084eec727b3e87e0c9de8e3593acb942ec1","raw":{"aspect":"P","body_system":"nervous_system","disease_id":"OMIM:619161","disease_name":"Carpal tunnel syndrome 2","evidence":"PCS","frequency_raw":"14/14","hpo_id":"HP:0012185","is_excluded":false,"label":"Constrictive median neuropathy","onset_id":null,"reference":"PMID:32686688","source_release":"2026-06-23"},"sourceGroups":["published"]},{"frequencyKind":"count","key":"8a53bad11f0aa5c3fae3c6a54a240d84e10af52a58e82cb431c92dbc6ad96020","raw":{"aspect":"P","body_system":"musculoskeletal","disease_id":"OMIM:619161","disease_name":"Carpal tunnel syndrome 2","evidence":"PCS","frequency_raw":"13/14","hpo_id":"HP:0003393","is_excluded":false,"label":"Thenar muscle atrophy","onset_id":null,"reference":"PMID:32686688","source_release":"2026-06-23"},"sourceGroups":["published"]},{"frequencyKind":"reported","key":"9b49ff900f1270b4d9007546d6013914a8ed57bb7e6af9f01cf0e6c4c72c77cc","raw":{"aspect":"P","body_system":"nervous_system","disease_id":"OMIM:115430","disease_name":"Carpal tunnel syndrome","evidence":"IEA","frequency_raw":null,"hpo_id":"HP:0009830","is_excluded":false,"label":"Peripheral neuropathy","onset_id":null,"reference":"OMIM:115430","source_release":"2026-06-23"},"sourceGroups":["omim"]},{"frequencyKind":"reported","key":"a348a85a85c8b4906de9d9cd00f81e817ebde1e16a47f1d9910878e72a23233f","raw":{"aspect":"P","body_system":"nervous_system","disease_id":"OMIM:115430","disease_name":"Carpal tunnel syndrome","evidence":"TAS","frequency_raw":null,"hpo_id":"HP:0012185","is_excluded":false,"label":"Constrictive median neuropathy","onset_id":null,"reference":"OMIM:115430","source_release":"2026-06-23"},"sourceGroups":["omim"]},{"frequencyKind":"count","key":"a52dd11bdb24688cbb48f51acfb1760fcdbae5fd2ed8bbb3ae1685059e55a5ff","raw":{"aspect":"P","body_system":"nervous_system","disease_id":"OMIM:619161","disease_name":"Carpal tunnel syndrome 2","evidence":"PCS","frequency_raw":"14/14","hpo_id":"HP:0033660","is_excluded":false,"label":"Hand paresthesia","onset_id":null,"reference":"PMID:32686688","source_release":"2026-06-23"},"sourceGroups":["published"]},{"frequencyKind":"reported","key":"cc8c94fbd8b1d9bda3d35aef6d5a3342ec2a6877cb50b507eee6beda93720525","raw":{"aspect":"P","body_system":"musculoskeletal","disease_id":"OMIM:115430","disease_name":"Carpal tunnel syndrome","evidence":"TAS","frequency_raw":null,"hpo_id":"HP:0012276","is_excluded":false,"label":"Digital flexor tenosynovitis","onset_id":null,"reference":"OMIM:115430","source_release":"2026-06-23"},"sourceGroups":["omim"]}],"referenceLabels":{},"references":{"causeHtml":"","identityNote":"MONDO cross-references identify native condition entries. Ancestor membership does not transfer phenotype values between groups.","importantHtml":""},"sections":[{"bodyHtml":"Carpal tunnel syndrome occurs when a nerve in the hand and forearm, known as the median nerve, gets pinched (compressed) within a passage called the carpal tunnel. The carpal tunnel is a narrow canal at the wrist through which the median nerve extends from the forearm to the hand and the first four fingers. It is surrounded by the wrist bones and connective tissues, which are tissues that support the body's joints and organs.
Carpal tunnel syndrome is often described as idiopathic because its cause is frequently unknown but can be influenced by lifestyle factors. Little is known about the genetic contributions to this condition. Most of the genes that have been studied provide instructions for making proteins that are components of connective tissues. Other genes associated with the condition play roles in nerve cell function, the immune system, or metabolism. Additionally, the width of the carpal tunnel varies among individuals; people with narrower passages are more likely to have nerve compression than are people with wider passages.
In carpal tunnel syndrome, nerve compression can be caused by many factors including inflammation of connective tissues surrounding the carpal tunnel, accumulation of fluids (edema) in the lower arm, hormonal changes, stress and trauma to the wrist, or obstructions within the carpal tunnel, such as a cyst or tumor. Carpal tunnel syndrome occurs in 20 to 45 percent of pregnant women, likely due to edema or hormonal changes, and often goes away at the end of the pregnancy.
Particular activities, often related to certain occupations, may increase a person's risk of developing carpal tunnel syndrome. Repeated use of tools that vibrate or require forceful movements can put stress on the wrist, causing swelling or inflammation around the carpal tunnel. Whether repeated tensing of the hand and wrist, caused by frequent computer use, increases the risk of carpal tunnel syndrome is unclear; the evidence is conflicting. It is likely that the impact of computer use on the development of carpal tunnel syndrome is minor.
While carpal tunnel syndrome can be a feature of many disorders, including obesity, alcohol use disorder, rheumatoid arthritis, type 1 diabetes, type 2 diabetes, hypothyroidism, kidney (renal) failure, transthyretin amyloidosis, and hereditary neuropathy with liability to pressure palsies, it usually occurs in people with no related health conditions.
","key":"forms","title":"What causes Carpal tunnel syndrome?"},{"bodyHtml":"In carpal tunnel syndrome, the pain or paresthesia is usually felt in the wrist, the palm, and the first four fingers of the hand. These signs and symptoms often develop during sleep and are noticeable upon waking. Affected individuals typically shake their hand to get rid of the pain and numbness, a characteristic move known as the flick sign. As the condition advances, the signs and symptoms begin to occur during the day as well. Affected individuals may have difficulty performing manual tasks such as turning doorknobs, fastening buttons, or opening jars. The symptoms of carpal tunnel syndrome may be triggered by certain activities that flex or extend the wrist, such as driving, typing, or holding a telephone.
Over time, people with carpal tunnel syndrome can have muscle and nerve wasting (atrophy) in the affected hand and a reduced ability to detect sensations, which can be mistaken for an improvement of symptoms.
Source: MedlinePlus Genetics
","key":"overview","title":"Condition overview"}],"sharedSources":[],"slug":"carpal-tunnel-syndrome","sourceDocuments":[{"name":"Carpal tunnel syndrome","reviewed":"2018-11","sections":{"causes":{"fetchedAt":"2026-10-20T20:20:04.898034+00:00","label":"Causes","pageSha256":"c6e7ac20e438d3dcae30f2df6185676257018a32a5dfcdc9b304f13a71311e0b","sourceUrl":"https://medlineplus.gov/genetics/condition/carpal-tunnel-syndrome/#causes","status":"available"}},"source_release":"2026-10-01","url":"https://medlineplus.gov/genetics/condition/carpal-tunnel-syndrome"}],"sourceNote":"MedlinePlus descriptions and Causes; original HPO annotations.","takeawayHtml":"Cause explanations are from MedlinePlus Genetics. Feature values below retain their original sources and patient groups.","title":"Carpal tunnel syndrome"},"schemaVersion":1}