Traction alopecia - certain hairstyles such as when you pull on your hair tightly can cause scarring of the hair follicles. If pulling is stopped before scarring to the scalp then your hair will grow back normally. Nervous habits such as continual hair pulling or scalp rubbing can also cause scarring and ultimately permanent hair loss. Excessive shampooing and blow-drying can also cause hair loss.
In addition to your hairstyle, the processes you use on your hair, whether it’s to add color or texture, can have a detrimental effect. For example, harsh chemicals for bleaching and straightening, along with excess heat, can damage and even kill hair follicles, Burg points out. Additionally, excessive chemical treatments applied directly on the scalp can cause inflammation. “Inflammation can damage the follicle, which in turn to can lead to hair loss,” says Maria Halasz, CEO of évolis Professional. To prevent over-processing, she recommends limiting chemical treatments on the scalp to every four to six weeks. Check out these tips for people who use heat on their hair every day.
Localized or diffuse hair loss may also occur in cicatricial alopecia (lupus erythematosus, lichen plano pilaris, folliculitis decalvans, central centrifugal cicatricial alopecia, postmenopausal frontal fibrosing alopecia, etc.). Tumours and skin outgrowths also induce localized baldness (sebaceous nevus, basal cell carcinoma, squamous cell carcinoma).
Pregnancy may cause many changes in the scalp hair. As the hormones fluctuate during pregnancy, a large number of women feel their hair thickens and becomes fuller. This may be related to change in the number of hairs cycling in the growth phase of hair growth, but the exact reason is unknown. Quite often, there may be a loss of hair (telogen effluvium) after delivery or a few months later which will eventually normalize.
Telogen effluvium - occurs mainly due to the body’s reaction to stress, brought about by, illnesses such as cancer, mental and emotional disturbances, medications such as blood thinners, hormonal imbalances, stress during childbirth and so on. In this condition hair thinning occurs on the scalp. The hair usually regrows after the stress period is over.