On Monday, 12 January 2026, between 07:00 and 10:00 CET (Amsterdam time), this website will be unavailable due to scheduled maintenance.
This resource focuses on side effects and other terms used in medicines information and assessments of medicines. It does not include terms that are used only rarely, nor does it cover most disease states or technical terms.
How to use EMA’s medical terms simplifier
- You can search for a term or click on a letter below to see terms beginning with that letter.
- Each entry contains a short description. For some, a longer or alternative description is available by selecting the term.
- We use ‘< >’ to indicate alternative or optional wording.
EMA’s medical terms simplifier will be updated periodically. For comments or suggestions, you can use our Medical terms simplifier comments form.
F
-
Faecal urgency
urgent need to open the bowels -
Familial
runs in the family -
Familial adenomatous polyposis
formation of numerous growths mainly in the large intestine -
Familial hypercholesterolaemia
high blood cholesterol levels that run in the family -
Fatigue
tiredness -
Febrile
feverish -
Febrile neutropenia
see neutropenia, febrile -
Ferritin
a protein that stores iron in the body -
FEV1 (forced expiratory volume in 1 second)
the most air a person can breathe out in 1 second -
Fibrillation
uncoordinated twitching of muscle <fibres> -
Fibrillation, atrial
irregular and uncoordinated contractions of the upper chambers of the heart <caused by problems in the flow of electrical impulses> <which may cause <palpitations> <fast heart beat>> -
Fibrillation, ventricular
dangerous, irregular and uncoordinated contractions of the lower chambers of the heart <caused by problems in the flow of electrical impulses> <which can stop the heart working> -
Fibrinolytic
dissolves blood clots made out of a substance called fibrin -
Fibroids
non-cancerous growths in the womb -
Fibrosis
tissue scarring and thickening -
Fibrosis, pulmonary
lung damage with tissue scarring and thickening -
Fissure
tear or crack -
Fistula
abnormal passageway <between the gut and other organs> -
Flare
worsening of disease -
Flatulence
gas -
Flu, complicated
serious effects of flu generally requiring hospital care -
Flushing
reddening of the skin -
Flutter, atrial
rapid contractions of the upper chambers of the heart <caused by problems in the flow of electrical impulses> <which causes strain on the heart because the upper and lower chambers are beating at different speeds> -
Follicles
small sacs <in the ovary> that hold the eggs -
Folliculitis
inflammation of hair follicles -
Forced expiratory volume
the most air a person can breathe out <in one second> -
Forced vital capacity
a measure of how much air the lungs can hold -
Formication
a sensation of something crawling on or under the skin -
FVC
see forced vital capacity