Rebels from the ethnic Tutsi-led M23 movement are blocking the two main roads into Goma from the north and the west and preventing produce from getting through.
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Goma's population has swelled in recent days with people running from the advancing fighters.
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Laurent Cresci, from the International Committee of the Red Cross (ICRC), told the BBC from the state-run Bethsaida Hospital in Goma that patient numbers had surged on Wednesday: "It was really a mass casualty. We were before 80 patients in our ward, and now we have 130 patients so it's really hard to manage."
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"We all know that the reason of this war is economic. Rwanda is continuing... for the past 25 years… looting our mineral resources," Congolese Communications Minister Patrick Muyaya told the BBC, urging the UK to use its influence with Rwanda to ease the situation.

https://www.bbc.co.uk/news/world-africa-68255614