1. Hair color. Anytime you dye your hair, you’re increasing the diameter of each strand, which can help add volume when your hair is sparse and fine. As a general rule, ask your colorist to make sure highlights are finer at the top of the head, where hair is the thinnest, and more intense at the bottom, where it’s thickest, says Eva Scrivo, a hairstylist and the owner of the Eva Scrivo Salon in New York City. And beware: A color that contrasts with your scalp (blonde tones if your scalp is dark, deep brunettes if your scalp is light) will make any visible scalp more obvious.
1. Collagen powder. Preliminary studies suggest that marine-sourced collagen may stimulate hair growth, says New York City dermatologist Yoon-Soo Cindy Bae. Though more research is needed, participants in studies reported thicker hair after three to six months of daily use. Crushed Tonic Original Powder ($105) easily mixes into coffee, tea, and water.
Trichotillomania, classified as an “impulse control disorder,” causes people to compulsively pull their hair out. “It’s sort of like a tic, the person is constantly playing and pulling their hair,” says Dr. Glashofer says. Unfortunately, this constant playing and pulling can actually strip your head of its natural protection: hair. Trichotillomania often begins before the age of 17 and is four times as common in women as in men.
Hair loss induced by cancer chemotherapy has been reported to cause changes in self-concept and body image. Body image does not return to the previous state after regrowth of hair for a majority of patients. In such cases, patients have difficulties expressing their feelings (alexithymia) and may be more prone to avoiding family conflicts. Family therapy can help families to cope with these psychological problems if they arise.[12]
There are several different types of medication you can buy to help treat hair loss. Procepia and Finasteride are currently the only approved drugs you can take that will effectively treat hair loss. The active ingredient in both treatments (finasteride) works by blocking DHT (the male hormone dihydrotestosterone) that causes hair loss by shrinking hair follicles on your scalp. It has been proven to lead to hair regrowth or to stop hair loss in around 9 out of 10 men in clinical trials. 
Trichotillomania, classified as an “impulse control disorder,” causes people to compulsively pull their hair out. “It’s sort of like a tic, the person is constantly playing and pulling their hair,” says Dr. Glashofer says. Unfortunately, this constant playing and pulling can actually strip your head of its natural protection: hair. Trichotillomania often begins before the age of 17 and is four times as common in women as in men.
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.
Your body needs a way to convert hair growth  nutrients floating around your bloodstream into something it can use. Enter magnesium. This enzyme-related element assists in breaking down nutrients into useable compounds and creating new proteins for hair production. One of these compounds is melanin, responsible for giving your hair its natural color.
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.
Hair follicles on our head are at various stages of this hair growth cycle, so that while some hair follicles are in the last stages, others are just beginning their anagen phase, while others still are in the middle of the hair growth cycle. It's because of these varying stages of growth that our hair doesn't fall out all at once. Instead, you only shed about 50 - 100 strands a day - this is the normal rate of shedding hair.

It will be a mistake if lack of volume does not appear on the list of common hair problems. Happening for both men and women, lack of volume can be the factor that destroys one’s hair and affects his or her look. There are plenty of reasons leading to the lack of volume of flat hair, including thyroid problems, hormone-related conditions, low iron levels, and nutrition. It is believed that the wrong shampoo or inappropriate conditioner can make your hair too heavy and result in lack of volume. Sometimes, product build-up can be the hidden causes for most of the common hair problems, including lack of volume.

However, researchers are still working to determine the best dose needed, whether the results are lasting, and whether they can develop a topical form of the drug, Day said. She added that patients should be aware that Tofacitinib has side effects. It's already associated with an increased risk of serious infections, as well as stomach and intestinal tears, according to Pfizer, the manufacturer.

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