A diffused thinning pattern is common over the top of the head, whilst the hairline often remains intact. A common noticeable aspect is the natural parting area becomes wider and the scalp more visible through the remaining hair. Diffused thinning can affect the entire scalp, known as DUPA. Common causes can be illness, stress, infection, medical such as thyroid and crash diets to name a few. This excessive shedding of hair is called Telogen Effluvium (TE). Happens when there is a change in the number of hair follicles growing hair. If the number of hair follicles producing hair drops. TE pattern of loss, cosmetically anyway, is more obvious over the top of the scalp although it can affect the entire head of hair.
Diffused thinning can leave a relatively high density of hairs over the scalp and no specific areas of hair loss. Unlike male pattern hair loss where there is a temple recession or the crown opens. This makes placing hair between the existing hair troublesome. Potentially creating permanent shock-loss to the existing hair. Even if possibly the change can be relatively minimal unless a high number can be transplanted. Especially if the diffused pattern is wide. If isolated to a smaller area then a good cosmetic improvement is much more possible. In respect of DUPA cases, a hair transplant has no safe zone to remove hair from therefor this rules out the possibility of a safe hair transplant.