A common skin condition, alopecia areata usually starts as a single quarter-sized circle of perfectly smooth bald skin. These patches usually regrow in three to six months without treatment. Sometimes, white hair temporarily regrows and then becomes dark. The most extensive form is alopecia totalis, in which the entire scalp goes bald. It's important to emphasize that patients who have localized hair loss generally don't go on to lose hair all over the scalp. Alopecia areata can affect hair on other parts of the body, too (for example, the beard or eyebrows).
Some companies market special hair growth vitamins and supplements that you can buy to make it easier for you to stay healthy and help prevent hair loss. In general, however, all you need to do is make sure that you are getting enough protein in your diet (eating lots of protein-rich foods like dark green leafy vegetables, fish, eggs and beans), and the right levels of iron, zinc and vitamin A. B, C and folic acid. 
See a doctor. While it may be easy to treat hair loss that's caused by stress or other physical or emotional shock, other types, especially those caused by medical conditions, require expert attention. Do not self-medicate. A medical test is necessary to determine the real cause of your hair loss. A medical diagnosis is important in order to rule out other factors that might be the cause of your hair loss. On the surface, it's easy to attribute hair loss to stress or the lack of sleep, but it is highly possible that the hair loss may be caused by an unknown or undetected condition related to hormones or genetics. With the right diagnosis, you'll be able to get the right medication and course of treatment.
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+. 
It's no myth that excess stress can literally make your hair fall out. How does this happen? Well, it can raise androgen (male hormone) levels, which in turn can causes hair loss. "Stress may also trigger scalp problems, such as dandruff, disrupt eating habits and mess with the digestive system – all of which can have a negative impact on hair" says Anabel.

Cyproterone acetate was also developed in the 1960s. It blocks the effect of androgen hormones and is an alternative to spironolactone for women with patterned hair loss. It is a weak progestogen and is found in some oral contraceptives (the pill). Cyproterone acetate can also be used to treat acne, unwanted facial and body hair, and hereditary hair loss in women. Cyproterone acetate requires a prescription from your doctor.
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.
Massage your scalp with hot oil preferably coconut, castor or olive oil. Take the warm oil on hand and apply it to your scalp. Rub your fingers on the scalp in a circular motion, applying gentle pressure. Keep kneading occasionally. This will open up the blood vessels and increase blood flow to your head and strengthen your hair follicles as well, encouraging new hair growth.
According to the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMSD), alternative therapies may not help hair regrow and many are not supported by medical research. However, other treatments that reportedly improve alopecia areata include Chinese herbs, acupuncture, zinc and vitamin supplements, evening primrose oil and aroma therapy. 
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.
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