While the findings can't prove hair grooming is at the root of the problem, women might still want to take them into consideration, said Dr. Angela Kyei, who worked on the study.

"I won't tell you not to braid your hair, but I don't want you to braid it so tightly that you need to take pain medication," said Kyei, of the Cleveland Clinic in Ohio.

Prolonged pulling at the hair strands may cause inflammation of the hair follicle, which has been shown to lead to scarring. In principle, that could lead to a type of balding that dermatologists call central centrifugal cicatricial alopecia, or scarring hair loss.

This type of balding starts at the top of the scalp and then spreads slowly to the rest.

Observations from the 1960s had hinted it was related to hot-comb straightening, but little research has looked at other explanations.

The new study, published in the Archives of Dermatology, is based on health questionnaires and scalp examinations of 326 African American women.

third of those with less severe hair loss.

"This is just telling us there is a trend and we need to study it further," said Kyei, adding that it doesn't mean these hair styles are necessarily tied to balding, which could have other causes.

In fact, the researchers also found women with type 2 diabetes were more likely to have scarring hair loss, as were those with bacterial scalp infections.

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