Is phlegm in the throat a common problem after surgery?

Some patients will experience some irritation post op (especially after having been intubated for general anesthesia). This irritation can manifest as increased secretions. However, this is typically self limited and short lived.The post operative phase (especially following abdominal surgery) is a risk for pulmonary infection. Patients will typically splint and take shallow breaths secondary to the pain associated with full and deep inspiration. If efforts are not made to clear these secretions and breathe deeply it can progress to more serious conditions such as pneumonia.The best recommendation is good pain control and deep breaths. These together will help to clear the secretions and avoid a lingering worsening problem.As always, discuss your concerns with a board certified plastic surgeon (ABPS). 

I know of no direct cause of prolonged phlegm after surgery. The irritation from the intubation should resolve relatively quickly. There are other causes of secretions that may need investigation. Coughing and deep breathing after surgery is helpful to reduce other potential issues. If it persists - I would discuss with the Operating Surgeon .

This is related to the breathing tube being placed and can cause an irritation. I would suggest following up with your board certified surgeon about this.