[{"n": "Acrocyanosis", "u": "/e/ailments-of-unknown-cause/acrocyanosis/", "s": "Persistent blue discoloration of extremities, often benign but sometimes a sign of serious illness."}, {"n": "Acute interstitial pneumonitis", "u": "/e/ailments-of-unknown-cause/acute-interstitial-pneumonitis/", "s": "Rare, severe lung disease of unknown cause with rapid progression."}, {"n": "Attention deficit hyperactivity disorder", "u": "/e/ailments-of-unknown-cause/attention-deficit-hyperactivity-disorder/", "s": "A neurodevelopmental disorder marked by inattention, hyperactivity, impulsivity, and emotional dysregulation."}, {"n": "Baby colic", "u": "/e/ailments-of-unknown-cause/baby-colic/", "s": "Excessive crying in an otherwise healthy infant, typically resolving by 4 months."}, {"n": "Bell's palsy", "u": "/e/ailments-of-unknown-cause/bell-s-palsy/", "s": "Scottish surgeon who linked the facial nerve to paralysis."}, {"n": "Benign paroxysmal vertigo of childhood", "u": "/e/ailments-of-unknown-cause/benign-paroxysmal-vertigo-of-childhood/", "s": "A childhood migraine subtype causing brief vertigo episodes."}, {"n": "Blain (animal disease)", "u": "/e/ailments-of-unknown-cause/blain-animal-disease/", "s": "An 18th- and 19th-century animal disease of unknown cause."}, {"n": "Thromboangiitis obliterans", "u": "/e/ailments-of-unknown-cause/thromboangiitis-obliterans/", "s": "A tobacco-linked vascular disease causing limb pain and gangrene."}, {"n": "Calciphylaxis", "u": "/e/ailments-of-unknown-cause/calciphylaxis/", "s": "Rare syndrome of painful skin lesions from small vessel calcification."}, {"n": "Cholinergic urticaria", "u": "/e/ailments-of-unknown-cause/cholinergic-urticaria/", "s": "Chronic hives triggered by heat, sweat, or exercise."}, {"n": "Cluster headache", "u": "/e/ailments-of-unknown-cause/cluster-headache/", "s": "A neurological disorder causing severe, recurring unilateral headaches."}, {"n": "Copenhagen disease", "u": "/e/ailments-of-unknown-cause/copenhagen-disease/", "s": "Rare spinal disorder with progressive anterior vertebral fusion."}, {"n": "Dancing mania", "u": "/e/ailments-of-unknown-cause/dancing-mania/", "s": "A mysterious dancing plague that swept Europe for centuries."}]