Sweid was born to an Arab Christian family in Haifa, Israel. He is a graduate of the theater department at Tel Aviv University, and took his first steps in theater when he joined the Arab-Hebrew Theater in Jaffa. He went on to participate in television shows including Dancing again tonight (1991), Lane of White Chairs (a winner at the 1996 Acre Festival), Oh Brother Boom Boom (which in 2003 won at the Haifa festival for children's programming), Dragon (2004), and Immigrants (2005).
Sweid also participated in the international production The Time We Did Not Know Anything About Each Other, and in the dance production Barefoot. In 2001 he became Director of a community theater program for both Arabs and Jews in Ramallah.
Sweid was married to Yael Ronen, a Director at the Cameri Theatre. They had a son in 2009. In 2015 they divorced.
In 2016 he joined the HBO series Game of Thrones in Season 6 as a Meereenese freedman.
