Sanidad literally translates to "sanity" or "mental health". It's a word that carries a lot of weight and isn't something you hear in a typical love song.
In "Basta Ya," the singer uses it to express the sheer intensity of her feelings, crying out, "Pierdo hasta la sanidad" (I'm even losing my sanity). This dramatic line reveals the song's core conflict: a love so deep and obsessive that it borders on madness, making her plead for it to stop.
The Marías lean right into the tug-of-war between sweet devotion and utter emotional exhaustion in "Basta Ya". The speaker wants to grow old together and wake up side by side: "Contigo envejecer / Contigo amanecer" [To grow old with you / To wake up with you]. They melt when touched, singing "Tus manos me calman" [Your hands calm me]. Yet right alongside that tenderness sits total desperation. The phrase "Basta ya" translates directly to "Enough already!" or "Stop it now!" It is what you shout when your brain is overloaded. The singer begs a partner to return home with "Vuelve a casa ya" [Come home now], but the waiting is doing real damage.
The drama spikes halfway through when loving this person starts feeling dangerous. The singer admits, "Aunque me está matando y más / Pierdo hasta la sanidad" [Even though it is killing me and more / I am even losing my sanity]. In everyday Spanish, sanidad usually refers to public healthcare or sanitation, but here it is used as a direct borrowing of "sanity" (the standard word would be cordura), showing their head spinning out of control. It turns into an obsession they cannot turn off: "Y pienso en ti, basta ya / Es que ya no puedo más" [And I think of you, enough already / I just can't take it anymore]. You get this tense loop of someone crying their eyes out, begging for touch, and yelling at their own thoughts to finally quit.