British singer Amy Winehouse has been suffering from an unclear medical condition that her father now says is emphysema in the early stages.

The 24-year-old Grammy Award winning singer was hospitalized in London last week after collapsing in her home and remained in hospital for a couple of days while doctors tried to discover the nature of her health problem.

Mitch Winehouse revealed to the Sunday Mirror in the U.K. that his talented but troubled daughter has “serious health problems.” While tests she has undergone ruled out tuberculosis, the frail songstress is nevertheless in a fragile condition.

Her father explained to the British paper that the years of “smoking the crack cocaine and the cigarettes” have made her lungs “all gunked up.”

“There are nodules around the chest and dark marks. She’s got 70 percent lung capacity,” her worried dad continued.

Winehouse’s parents have spoken publicly before about their daughter’s troublesome substance abuse problem, even going as far as asking fans to not buy her albums anymore so that she would not have the money to buy drugs.

The two have sounded hopeful before as well, following one of their daughter’s attempts at rehabilitation. In February, when a couple of weeks spent in a London rehabilitation facility were happily followed by Winehouse’s triumph at the 50th Grammy Awards ceremony, mom Janis Winehouse was endearing with her renewed hope.

She told British television morning show GMTV at the time that her girl was “on the road to recovery.”

Winehouse’s road to recovery has been a bumpy one since then, though, and more bumps seem to surface on the horizon. And somehow, words like “Don’t worry about me, dad. I know I’ve got to stop taking drugs now,” like Mitch said he heard from his daughter upon taking her to the hospital, are not convincing enough.

Winehouse passed out Monday afternoon, a week ago, and was taken by her dad to the London Clinic “as a precaution.” She slept for three consecutive days, Mitch said, and it was just in time, as another month of her recent lifestyle would have led to serious consequences.