Medical experts have been unable to tell a grieving family what killed their teenage daughter.

Schoolgirl Palwasha Khan was found dead in her bedroom last September, and toxicology tests ruled out drugs and alcohol and her body showed no signs of trauma or disease, a Bradford inquest heard yesterday.

The 14-year-old had been on medication for migraines over the past 14 months and was severely anaemic, but neither of those conditions could be blamed for her death, consultant pathologist Dr Karen Ramsden told the hearing.

The day she died Palwasha had complained of a migraine and taken medication before going to bed.

She was found collapsed on the floor upstairs as if she had fallen out of bed, the inquest was told.

An ambulance was called but despite efforts to resuscitate her, “no gain was made,” said Bradford Coroner Roger Whittaker.

He told the family: “It’s always difficult when young people die out of time and the cause hasn’t been precisely established.

“The cause of death is unascertained. There’s no evidence of trauma, drugs or alcohol. Any unnatural cause has been ruled out therefore it must be a natural death verdict.

“It’s unsatisfactory for the family but I believe it’s more satisfactory than leaving it as an open verdict.”

Her distraught father also asked what guarantee he could give his other three daughters that the same would not happen to them.

Mr Whittaker told him: “They look well to me.

“If there’s any problems you should ensure they see a doctor and give the background history so medics are aware their sister had an unnatural death.”

Palwasha’s family asked for any remaining samples from her body to be kept for research.