The feeling that you are not able to get a good breath or are not getting enough oxygen can be alarming and uncomfortable. Shortness of breath, or dyspnea, may be a result of several underlying problems. In patients with MDS, anemia may predispose you to feeling short of breath with activity. Deconditioning due to inactivity may also predispose you to shortness of breath with activity.
Cancer.net: Shortness of Breath or Dyspnea
American Cancer Society: Shortness of Breath
Oncolink: Shortness of Breath https://www.oncolink.org/support/side-effects/shortness-of-breath-dyspnea