Baldness includes a set of disorders which involve the state of lacking hair where it would normally grow, especially on the head.

Male pattern baldness It is characterized by hair receding from the lateral sides of the forehead, known as "receding hairline" or "receding brow."

DHT a powerful sex hormone.

Female pattern baldness in which the midline parting of the hair appears broadened, is less common. It is believed to result from a decrease in estrogen, a hormone that normally counteracts the balding effect of testosterone, which normally occurs in women's blood.

Traction alopecia is most commonly found in people with ponytails or cornrows who pull on their hair with excessive force.

Hats Wearing a hat shouldn't generally cause this, though it is a good idea to let your scalp breathe for 7 hours a day

Alopecia is the medical term for hair loss.

Alopecia areata is a term for spot baldness there are many different forms and severities and may be reversed or not. 

Shaving hair makes it grow back stronger Shaving one's head doesn't increase the number of healthy hair present on the scalp, and, when the remaining hair has grown a few millimeters, no enhancement in thickness or overall quality can be observed.

Does stress caused baldness it has shown to increase baldness on some level

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