In a statement on Wednesday, the World Health Organization (WHO) warned of "staggering health needs" across the occupied Palestinian territory, saying the conflict sparked further population displacement and exacerbated a prolonged humanitarian crisis.
"Over 77,000 people were internally displaced and around 30 health facilities have been damaged," it said, reports the Al Jazeera.
The WHO said it was "scaling up its response to provide health aid for almost 200,000 people in need", across the occupied Palestinian territory, including the occupied West Bank.
"The situation is volatile. WHO remains concerned … and calls for unhindered access for humanitarian and development-related essential supplies and staff into Gaza and referral of patients out of Gaza whenever needed," WHO's Rik Peeperkorn said.
Meanwhile, the head of the International Committee of the Red Cross (ICRC) appealed for more than $16m to help the people in Gaza.
"Fear, anxiety and stress were the key words I heard repeatedly today," ICRC head Robert Mardini told Al Jazeera after touring Gaza areas devastated by the Israeli bombardment.
"Even if the escalation was shorter than in previous situations, it will take years to rebuild what was damaged only in 11 days," he said, calling for "a meaningful political solution to [end] this longstanding conflict".
"In the meantime, we need to really step up our support in order to beef up the humanitarian response in the Gaza Strip in the short term."