The first wave of COVID killed a bunch of doctors and nurses, and burnt a lot more out.
Then Delta made a bunch more doctors and nurses quit, with wide reports right now that 20% of nurses are looking to up and leave their job. Talking to my friends who are nurses, they are short staffed, and have been for some time.
On top of that, the way the US does medical training for both nurses and doctors ensures we don't have enough medical professionals during normal times. Nursing schools can't find instructors (pay is too low) and hospitals are purposefully limiting the number of residency spots available to ensure prices for medical care stay high (https://en.wikipedia.org/wiki/Residency_(medicine)#Financing...)
So, you know, business as usual in the US.