Conversation so far:
What health problem did Aretha Franklin have?
Aretha Franklin had weight issues for many years.
Did Aretha Franklin have any other health issues besides her weight?
A former chain smoker who struggled with alcoholism, Aretha Franklin quit smoking in 1992.
Did Aretha Franklin have any other health issues besides her weight, smoking, and drinking?
In 2010, Aretha Franklin canceled a number of concerts to have surgery for an undisclosed tumor.
Was Aretha Franklin's tumor surgery in 2010 successful?
Discussing the surgery in 2011, Aretha Franklin quoted her doctor as saying that it would add 15 to 20 years to her life.
Did Aretha Franklin have any other health issues after 2010?
In May 2013, Aretha Franklin canceled two performances because of an undisclosed medical treatment. She also canceled the July 27 show in Clarkston, Michigan due to continued medical treatment.

Question: how did her health issues affect her singing career?
Self-contained rewrite: How did Aretha Franklin's health issues affect her singing career?