la acidez

Podría ser la acidez.

It could be the acidity.

— Ratatouille (2007)

Mi novia sufre de acidez.

My girlfriend suffers from heartburn.

Se ve que la pobre notaba mucha acidez.

It seems the poor thing was experiencing a lot of heartburn.

— Cuentos de Tokio (1953)

Tom tiene acidez.

Tom has heartburn.

Tengo una acidez terrible.

I have terrible heartburn.

Y esa acidez.

And that acidity.

— Ha vuelto (2015)