She firstly joined, Ahfad University for Women as teaching assistant in 1985 till 1986; Siddia worked as research assistant, Iowa State University, Ames, 1986–1988; lecturer, head school of family science, Ahfad U. for Women, Omdurman, 1988–1990; graduate assistant, Iowa State University, Ames, 1990–1992; assistant professor, Ahfad U. for Women, Omdurman, 1992–1995; lecturer, head School of Family Sciences, Ahfad U. for Women, Omdurman, since 1993; national project director reproduction health/family planning, Ahfad U. for Women, Omdurman, since 1995. International workshop coordinator Ahfad U. for Women, Omdurman, 1989. Principal investigator World Health Organization, Alexandria, Egypt, 1990.