Circulation problems mean trendy pants are not so hip, says doctor
They are the hippest fashion in town and guaranteed to turn heads - but medical research suggests it is not a designer label they should carry but a government health warning.
Canadian medical experts have slapped a health warning on hipster, or hip-hugging, jeans.
The warning, by Dr Malvinder Parmar, the medical director at Timmins and District Hospital in Ontario, says hipster jeans can cause paresthesia in the legs - a sensation of pricking, tingling or creeping on the skin.
Dr Parmar wrote to the Journal of the Canadian Medical Association on the issue.
He raised the alarm after seeing three slightly over-weight young women between the ages of 22 and 35 who had worn so-called hip-hugging trousers over the past six to eight months.
Their symptoms went away after they stopped wearing the low-cut trousers for between four and six weeks.
Chinese University obstetrics and gynaecology professor Lau Tze-kin also warned that the jeans - popular among the young and trendy in Hong Kong - could also cause inflammation of the pelvic area.