She was born on 5 December 1934 in Sidon, Lebanon, to a Syrian father and a Lebanese mother.

Ahmed, who started her singing career at 11, was one of the most famous singers of the golden age of Egyptian music in the 1950s and 60s.

She performed hundreds of songs and appeared in several films.

After her father returned to his home country of Syria, Ahmed auditioned for the Syrian radio, Damascus Radio, but was initially unsuccessful.

She then travelled to Aleppo and auditioned for Aleppo Radio, where she succeeded and soon gained fame. Damascus Radio then requested her to return, and she continued her career there.

Trained by composer Mohamed El-Naami, she became an official singer for Damascus Radio, allowing her career to flourish.

The singer then moved to Egypt, where she auditioned for Egyptian radio in Cairo. Radio presenter Salah Zaki introduced her with a song composed by Mohamed Mohsen. She later met the late composer Mohamed El-Mougi, with whom she collaborated on several highly successful songs. 

She also performed works penned by Farid El-Atrash, the best known of which are Ana Omri Kam Sana, Ya Halwatek Ya Gamalek, and Ya Akhi.

Other composers who wrote songs for Ahmed were Kamal El-Tawil and Mahmoud El-Sherif. She also performed songs composed by Mohamed Abdel Wahab, including the iconic Han El-Wad. 

Throughout her career, the singer also worked with Baligh Hamdi, Mohamed Sultan, who composed several songs for her, including her last Aywa Taabni Hawaak, and Riad El-Sonbati, who penned La Yarooh Qalbi for her.

Ahmed also ventured into cinema, starring in six films, including Tamr Henna (1957), starring alongside Ahmed Ramzy, Rushdy Abaza, Naima Akef, and Zeinat Sedki. Among her most successful film appearances was in Ana wa Banaty (Me & My Daughters, 1961), starring Salah Zulfikar and Zaki Rostom. Her last film was Montaha El-Farah (Ultimate Joy, 1964). 

Ahmed married Omar Naami, a Syrian national and owner of the Hilton Hotel. They had one daughter, Ferial, who later married Ahmed, the son of composer Riad Al-Sunbati.

She then married Egyptian composer Mohamed Sultan, and their marriage lasted 17 years, during which they had two sons, Tarek and Amr. The marriage ended in May 1981.

Fayza Ahmed later married officer Adel Abdel Rahman but divorced him after a short period. She reunited with her ex-husband, Mohamed Sultan, shortly before her passing. 

She passed away on 21 September 1983 at the age of 49, after a long battle with breast cancer.