"Fiebre" received widely positive reviews from music critics, who complimented its sensual lyrics and danceable production.

[6][7] The single was released for digital download and streaming by Sony Music Latin on the specified date and includes a solo version, alongside the original.

[9] Musically, "Fiebre" is a Spanish language reggaeton and pop song,[5][10][11] written by Víctor Rafael Torres Betancourt, Marcos Ramírez Carrasquillo, José Angel Torres Castro, Eliot José Feliciano, Martin, Andrés Castro, Yotuel Romero, Yandel, Beatriz Luengo, and Wisin.

[17] Throughout the song, Martin sings about an addictive lover and the heat of his feelings,[18] with lyrics, including: "Fiebre, pierdo el sentido / Me va bajando despacito por el cuello hasta el ombligo / Y sabes, no tiene cura" ("Fever, I lose my sense / It's going down slowly for me / From the neck to the navel / And you know, there's no cure") and "Yo me la paso cada día / Pensando en ti y en tus ojos negros / Y en tu risa bella" ("I spend every day thinking of you / And your black eyes / And your beautiful laughter").

They praised "the magic" behind Martin's voice, which is "accompanied by an infectious Caribbean rhythm, sensual lyrics and the urban touch" of the duo, describing the trio as "the perfect combination" that turn the track into "one of the great songs of 2018".

[21] Noelia Bertol from Cadena Dial ranked it as one of "Ricky Martin six collaborations that have us moving the skeleton" and said that since we can "not stop listening to it over and over again", it would cause "fever".

He continued to admire the solo version for its "danceable production" and "beguiling vocal performance", emphasizing that "it has all the makings of a major hit".

[18] Writing for 20 minutos, David Moreno Sáenz stated: "The chemistry between Wisin & Yandel and Ricky is fantastic, and it shows in the song and the video.

[31] "Fiebre" debuted at number 27 on the US Hot Latin Songs chart on March 10, 2018,[32] with a first-week tally of 4,000 downloads sold, 911,000 streams, and 6 million radio impressions.

[9] Martin premiered the video via a live broadcast on Facebook and uploaded it to his YouTube channel in a few hours after the song's release on February 23, 2018.

[68] The orange tinted video features a fusion of pre-Hispanic rhythms and dance in the intro, and refers to Aztec culture and landscapes of the city of Puerto Vallarta.

It begins with scenes of a touristic beach center, a native warrior dancing in a "candle-lit" church, and the singer soaking in a tub.

[16][61] The video shows Martin in a torn waistcoat being encompassed passionately, and in other sections, he appears immersed in a sea of candles and hot choreography.

Additionally, the music video features a seductive show of dancers raunchily twist behind each other and slowly move across a slightly warm glow-lit dark room.

The rendition began with Martin appearing solo on stage surrounded by dancers holding torches until Wisin & Yandel presented themselves.

[75] On December 1, 2018, Wisin & Yandel invited Martin as a guest to their Como Antes Tour and the trio performed "Fiebre" and "Adrenalina" together at the José Miguel Agrelot Coliseum in San Juan, Puerto Rico.

During the performance, Martin wore a black T-shirt with the flag of Puerto Rico drawn by his children, to raise funds for helping people and reconstructing houses, following Hurricane Maria.