There was an emergency.
'Emergenza' — e-mer-GEN-za. Stress on the third syllable. The 'ge' sounds like 'jeh'.
Use when something genuinely urgent happened that made keeping your plans impossible. The word 'emergenza' signals seriousness and immediately suspends any disappointment the other person feels.
'C'è stata' is the passato prossimo of 'esserci'. 'Un'emergenza' (an emergency) — note the elision: 'un'emergenza' not 'una emergenza'. This brief, serious phrase covers a wide range of genuine crises without requiring details.
È successa una cosa urgente.
An urgent thing happened.
Softer than 'emergenza' — implies seriousness without alarm
Devo gestire una situazione.
I need to manage a situation.
Vague but implies something requires your direct intervention
C'è un problema serio che non posso ignorare.
There's a serious problem I can't ignore.
Longer — emphasises the impossibility of ignoring it
Italians rarely pry further after hearing 'c'è stata un'emergenza' — it's a socially respected signal that something serious happened. The follow-up promise 'ti spiego a voce' (I'll explain in person) is expected and maintains trust.