Cosmetic procedures, such as shampooing too often, perms, bleaching, and dyeing hair can contribute to overall hair thinning by making hair weak and brittle. Tight braiding, using rollers or hot curlers, and running hair picks through tight curls can also damage and break hair. However, these procedures don't cause baldness. In most instances hair grows back normally if the source of the problem is removed. Still, severe damage to the hair or scalp sometimes causes permanent bald patches.
Every part of the body requires thyroid hormone for proper functioning, and that includes the hair follicles. In 2008, the Journal of Clinical Endocrinology and Metabolism presented the first evidence that human hair follicles are direct targets of thyroid hormones. This research demonstrated that the thyroid hormones T4 and T3 modulate multiple hair biology parameters from cycling to pigmentation.
There’s also a women’s version (Women’s Rogaine Foam) — but a three-month supply costs $22 more online. The only difference between the two products are the instructions; women are instructed to apply once a day instead of twice. If you’re a woman who doesn’t feel like paying extra for marketing, the men’s product will suffice. A cheaper generic version is Kirkland Signature Minoxidil Foam, but with a longer history on the market and more customer testimonials, Rogaine is our first choice.
As a senior writer for Live Science, Laura Geggel covers general science, including the environment and amazing animals. She has written for The New York Times, Scholastic, Popular Science and Spectrum, a site covering autism research. Laura grew up in Seattle and studied English literature and psychology at Washington University in St. Louis before completing her graduate degree in science writing at NYU. When not writing, you'll find Laura playing Ultimate Frisbee. Follow Laura on Google+. 
Laser treatments. Low-level laser therapy (LLLT) is used for the prevention and reversal of hair loss. Also known as red light therapy, cold laser, and soft laser, it is a form of light/heat treatment (therefore generally safer) that is used on cases of pattern baldness and alopecia areata. The procedure uses a device that emits light that penetrates into the scalp. The more commonly used lasers are the excimer, helium-neon and fractional erbium-glass. The procedure can increase the blood flow in the scalp to stimulate the follicles that are in resting or dormant phase to go into anagen, and at the same time, prevent the production of DHT, which destroys the hair follicles. 

4. Tinted dry shampoo. Camouflage spots where you’re seeing more scalp than you want to (your hairline, a widening part, a thinning crown) and add volume with a colored dry shampoo (try Orlando Pita Color Boost Dry Shampoo in Light or Dark Tones, $22). But be sure to give your scalp a vigorous shampoo during your next shower — dermatologists recommend keeping your scalp free of styling products so you’re not clogging already taxed pores.
Central centrifugal cicatricial (scarring) alopecia: This type of hair loss occurs most often in women of African descent. It begins in the center of the scalp. As it progresses, the hair loss radiates out from the center of the scalp. The affected scalp becomes smooth and shiny. The hair loss can be very slow or rapid. When hair loss occurs quickly, the person may have tingling, burning, pain, or itching on the scalp. Treatment may help the hair re-grow if scarring has not occurred.
Acupuncture is a form of Chinese medicine that has been practiced for thousands of years. Its applications are many, and some researchers believe that it may help with hair loss from alopecia areata. How? The needles inserted into the scalp may help stimulate hair follicles and promote regrowth. More research needs to be done in this area, but consider asking your doctor for a referral to a licensed acupuncturist if this treatment sounds appealing to you. (Learn more about acupuncture for hair loss.)
Hair transplantation is usually carried out under local anaesthetic. A surgeon will move healthy hair from the back and sides of the head to areas of thinning. The procedure can take between four and eight hours, and additional sessions can be carried out to make hair even thicker. Transplanted hair falls out within a few weeks, but regrows permanently within months. Hair transplants, takes tiny plugs of skin, each which contains a few hairs, and implants the plugs into bald sections. The plugs are generally taken from the back or sides of the scalp. Several transplant sessions may be necessary.[33]
There is no hard and fast answer. With Regaine Extra Strength results may be seen after 8 weeks. Clinical studies have shown that for Regaine Regular Strength or Regaine Gel for men regrowth can occur as early as 16 weeks. But remember that everyone is different so you need to be patient. Studies suggest that Regaine should be tried for 6-12 months before deciding whether to continue.
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