The word you're searching for is "etiology", as in; "The patient presented complaining of severe lower Back pain, etiology unknown."
Etiology means cause of an illness.
Etiologic is the medical term meaning "causing." In a sentence, you might say, "Group A beta strep is the etiologic agent for strep throat."
An infection around the nail that can cause inflammation is paronychia.Onychomycosis and an infection around the nail that can cause inflammation is paronychia.Paronychia
plica
Wernicke's encephalopathy is the medical term meaning degenerative brain disorder caused by lack of thiamine.
Anacusis is the medical term meaning complete deafness.
Syncope is the medical term meaning fainting.
Cystitis is the medical term meaning inflammation of the bladder. A bladder infection is one possible cause of cystitis.
Marfan's syndrome is the hormonal disorder that can cause enlargement of the extremities. Acromegaly is the medical term meaning enlargement of the extremities.
Lamina is the medical term meaning layers.
Sensation is the medical term meaning feeling.
Flexion is the medical term meaning bending
Atrophy is the medical term meaning shrinking.
Alimentation is the medical term meaning food.