"We have no time to lose", says Ocha chief Tom Fletcher in a statement.
"After 15 months of uninterrupted war, the humanitarian needs are shocking", he continues.
During the ceasefire, significantly more humanitarian aid will be allowed to flow into Gaza, after a long time where only smaller shipments have been allowed to reach.
The challenges ahead in the health sector are enormous, states the World Health Organization (WHO) in a press release.
Half of Gaza's 36 hospitals are still partially operational, almost all hospitals are damaged or partially destroyed. Barely four out of ten healthcare facilities are functional, according to WHO.
Specialized healthcare is largely inaccessible, while an estimated 30,000 people injured during the war are in need of continued rehabilitation.
"This is a moment I have requested and hoped for. But addressing the enormous health needs and restoring the health system in Gaza will be a complex and challenging task given the extent of the destruction", writes WHO chief Tedros Adhanom Ghebreyesus on X.
