How to Say "stiffness" in Spanish
The Spanish word for “stiffness” is “erección” — B2 level.

Examples
El médico explicó cómo funciona una erección desde un punto de vista biológico.
The doctor explained how an erection works from a biological point of view.
Muchos factores pueden afectar la capacidad de mantener una erección.
Many factors can affect the ability to maintain an erection.
Es importante hablar con naturalidad sobre la salud y la erección con un especialista.
It is important to talk naturally about health and erections with a specialist.
Always Feminine
Even though it often refers to male anatomy, the word itself is feminine because it ends in '-ción'. Always use 'la' or 'una'.
Using the 'the' (Article)
In Spanish, when talking about body functions in a general sense, we often use the definite article ('la') where English might use 'an' or no article at all.
Wrong Gender
Mistake: “el erección”
Correction: la erección (words ending in -ción are almost always feminine).
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