He is known for providing medical assistance as a surgeon in twelve crisis and conflict areas, like in Iraq, Lebanon, Syria, and Yemen, where he supported local clinics and doctors, particularly in the Gaza Strip.

[3] Abu-Sittah returned to the Gaza Strip after the start of the 2023 Israel–Hamas war, where he provided medical assistance with Doctors Without Borders out of the Al-Shifa Hospital.

[7][8] After receiving his medical education at the University of Glasgow and completing his residency training in London, Abu-Sittah and began working for the National Health Service (NHS).

[13][14] He worked on voluntary missions in twelve crisis and conflict areas in the West Asia, like in Iraq, Lebanon, Syria, and Yemen, where he supported local clinics and doctors.

[18][8][19][20] Abu-Sitta was at Al-Ahli Arab Hospital during the night of the attack and wrote: "This incident served as a litmus test for what was to come: Israel’s full war on Gaza’s healthcare infrastructure.

[8][24][7] On 18 November, after 43 days voluntary work during the war, Abu-Sittah returned to England, as he became "redundant" because he could no longer perform surgeries due to a lack of medical supplies.

[29][18][24][7] And he gave evidence to the International Court of Justice (ICJ) for South Africa's genocide case against Israel.

", further characterising the supporting western powers, including the US, UK, Germany, France, Australia and Canada, as being "the axis of genocide".

[32] In April 2024, German authorities denied his entry to Germany while he was en route to speak at the Palestine Congress conference in Berlin where he would present evidence on the war in Gaza and his witness statement as a doctor working in two hospitals.

Berlin also denied entry to Germany to other guests, including former Greek Finance Minister Yanis Varoufakis (DIEM25), who was also due to speak at the Palestine Congress conference.

[15] Abu-Sittah was scheduled to speak to authorities in the ICC, which was exploring issuing arrest warrants for Israeli war criminals, including Prime Minister of Israel Benjamin Netanyahu.

[41] Ghassan Abu Sitta is recipient of several recognitions including the Royal College of Surgeons fellowship in 2010 and the American University of Beirut Humanism and Professionalism award in 2015.