Difficulty Breathing When Lying Flat
Some people feel reasonably comfortable when sitting upright but become short of breath after lying down.
They may:
* Need extra pillows to sleep
* Prefer sleeping partly upright
* Wake up feeling breathless
* Need to sit or stand to breathe comfortably again
This can happen when fluid backs up toward the lungs. The American Heart Association lists difficulty breathing while lying flat and sudden breathlessness during sleep among important heart-failure symptoms.
## 3. Swelling in the Feet, Ankles, or Legs
Heart failure can cause the body to retain
