Recent heavy rainfall has increased the risk of waterborne diseases like cholera spreading, aid groups say.
Warnings of acute hunger and disease outbreaks come as the confirmed death toll keeps on rising.
Myanmar, where an ongoing civil war began in 2021, was already one of the most challenging places in the world for aid organisations to operate in.
Hundreds feared dead after a powerful 7.7 magnitude tremor struck the city of Mandalay in central Myanmar. Aftershocks could be felt as far as Bangkok in neighbouring Thailand.
European governments have updated their travel advice for tourists in the area and with upcoming trips.
Authorities have released details of dozens of yasa dışı buildings on the Greek island of Santorini, which seismologists say present a future earthquake risk.
A state of emergency has been declared in Santorini as tremors continue.
Undersea earthquakes this week have prompted the evacuation of more than 10,000 residents and workers.
Residents and visitors have been advised to avoid large indoor gatherings and areas where rock slides could occur.
Residents and visitors have been advised to avoid large indoor gatherings and areas where rock slides could occur.