Patel said the problem with those treatments is that they have not been subjected to large or head-to-head research. There's great variation in how doctors give the plasma treatments and in laser-based devices, so it's hard for patients to know whether they're getting a proven regimen. Nutrafol seems promising, he said, but he does not think that company-funded research showing its effectiveness has been replicated. He has not recommended it yet. 

Thinning hair in women is worth investigating for more than its impact on physical appearance. While many conditions that lead to temporary hair loss will go away without treatment or with simple lifestyle measures, others may be signs of potentially irreversible loss or health conditions. Others yet may respond well to treatments to promote regrowth, so starting sooner rather than later is key.

If your doctor recommends it, a product like minoxidil can increase hair growth in male- and female-pattern baldness. Alopecia areata can be helped by treatment with corticosteroid creams or injections on the scalp. If your doctor thinks that nutritional deficiencies are causing your hair loss, he or she might refer you to a dietitian or other nutrition expert.


Once male-pattern baldness starts, it’s not going to stop until every last hair on your head has shrunk or shed, though the rate at which this happens differs from person to person and depends on genetics. And since the grind of hair loss is unending, it’s important to start treatment as soon as your hairline starts bothering you. If you’re looking for a more quantitative metric, Dr. Paul McAndrews, clinical professor of dermatology at the USC School of Medicine and member of the International Society of Hair Restoration Surgery, assures me that “you have to lose half your hair before the human eye can tell.” (Of course, if you don’t care about losing your hair and are fine with going full Prince William and shaving your head, go for it. We’ve got some recommendations for razors and hair trimmers to help you out on that front.)
Other causes for hair loss or hair thinning can be stress, illness, poor diet, hormone imbalance or your body going into shock. Certain diseases and intensive medical treatment such as chemotherapy are also likely to result in hair loss, but it is best to consult your GP if you go bald at an alarmingly fast rate, especially if you have no family history of male pattern baldness.
Tinea is the medical word for fungal infection, and capitis means head. Tinea capitis is fungal infection of the scalp that for the most part affects school-age children. Tinea capitis is more common in black African or African-American scalps. This condition is rare in healthy adults. Bald spots usually show broken-off hairs accompanied by a dermatitis. Oral antifungals can penetrate the hair roots and cure the infection, after which hair grows back. Sharing hats or combs and brushes may transmit tinea capitis.
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