Mancanza vs. carenza vs. scarsità

The Italian words 'mancanza', 'carenza', and 'scarsità' all convey the idea of lack or shortage, but they have subtle differences in usage and connotation.

Mancanza

'Mancanza' refers to a general absence or lack of something, often used for both tangible and intangible things.
La mancanza di vitamine può causare problemi di salute.
(The lack of vitamins can cause health problems.)
Sento la mancanza della mia famiglia quando sono lontano.
(I feel the absence of my family when I'm away.)

Carenza

'Carenza' typically indicates a deficiency or shortage, often used in medical or technical contexts.
La carenza di ferro è comune nelle donne in gravidanza.
(Iron deficiency is common in pregnant women.)
C'è una carenza di personale qualificato in questo settore.
(There is a shortage of qualified personnel in this sector.)

Scarsità

'Scarsità' implies scarcity or insufficiency, often used for resources or supplies.
La scarsità d'acqua è un problema in molte regioni aride.
(Water scarcity is a problem in many arid regions.)
C'è una scarsità di alloggi a prezzi accessibili in città.
(There is a shortage of affordable housing in the city.)

Summary

While 'mancanza' is a general term for absence or lack, 'carenza' often refers to specific deficiencies, and 'scarsità' emphasizes the idea of scarcity or insufficiency of resources. 'Mancanza' can be used in emotional contexts, 'carenza' in technical or medical situations, and 'scarsità' when discussing limited supplies or resources.