ANSWER:
What you are describing seems normal to me. It’s what my friends & I experience too.

Here’s the best article I’ve found for you:

“Hair Loss

Baldness or hair loss is typically something only adults need to worry about. But in a few cases, teens lose their hair, too and it may be a sign that something’s going on. Hair loss during adolescence can mean a person’s sick or maybe just not eating right. Some medications or medical treatments, like chemotherapy treatment for cancer, also cause people to lose their hair. And people can even lose their hair if they wear a hairstyle that pulls on their hair for a long time, such as braids.

Losing hair can be stressful during a time when appearance really matters, but the good news is that hair loss that happens during the teen years is often temporary. Once the problem that causes it is corrected, the hair usually grows back.
Hair Basics

Our hair is made of a type of protein called keratin. A single hair consists of a hair shaft (the part that shows), a root below the skin, and a follicle, from which the hair root grows. At the lower end of the follicle is the hair bulb, where the hair’s color pigment, or melanin, is produced.

Most people lose about 50 to 100 head hairs a day. These hairs are replaced they grow back in the same follicle on your head. This amount of hair loss is totally normal and no cause for worry. If you’re losing more than that, though, something may be wrong. The medical term for hair loss losing enough hair that a person has visibly thin or balding patches is alopecia.

If you have unusual hair loss and don’t know what’s causing it, it’s a good idea to see your doctor. A doctor can determine why the hair is falling out and suggest a treatment that will correct the underlying problem, if necessary.
What Causes Hair Loss?

Here are some of the things that can cause hair loss in teens:

* Illnesses or medical conditions. Endocrine (hormonal) conditions, such as uncontrolled diabetes or thyroid disease, can interfere with hair production and cause hair loss. People with kidney and liver diseases and lupus can also lose hair. The hormone imbalance that occurs in polycystic ovary syndrome can cause hair loss in teen girls as well as adult women.
* Medications. Some medications that have hair loss as a side effect may be prescribed for teens. These include acne medicines like isotretinoin, and lithium, which is used to treat bipolar disorder. Diet pills that contain amphetamines can also cause hair loss. Chemotherapy drugs for cancer are probably the most well-known medications that cause hair loss, but some cancers including leukemia and lymphoma can cause hair loss even before treatment begins.
* Alopecia areata (pronounced: air-ee-ah-tuh). This skin disease causes hair loss on the scalp and sometimes elsewhere on the body. It affects 1.7% of the population, including more than 4 million people in the United States. Alopecia areata is thought to be an autoimmune disease, in which the hair follicles are damaged by a person’s own immune system. (In autoimmune diseases, the immune system mistakenly attacks healthy cells, tissues, and organs in a person’s body.) Alopecia areata usually starts as one or more small, round bald patches on the scalp and can progress to total hair loss, although total hair loss only happens in a small number of cases. Both guys and girls can get it, and it often begins in childhood. The hair usually grows back in 6 months to 2 years, but not always.
* Trichotillomania (pronounced: trik-o-til-uh-may-nee-uh). Trichotillomania is a psychological disorder in which people repeatedly pull their hair out, often leaving bald patches. It results in areas of baldness and damaged hairs of different lengths. People with trichotillomania usually need professional help from a therapist or other mental health professional before they can stop pulling their hair out.
* Hair treatments and styling. Having your hair chemically treated, such as getting your hair colored, bleached, straightened, or permed, can cause damage that may make the hair break off or fall out temporarily. Another type of baldness that results from hair styling can actually be permanent: If a person wears his or her hair pulled so tightly that it places tension on the scalp, it can result in a condition called traction alopecia. Traction alopecia can be permanent if the style is worn for a long enough time that it damages the hair follicles.
* Poor nutrition. Poor eating can contribute to hair loss. This is why some people with eating disorders like anorexia and bulimia lose their hair: The body isn’t getting enough protein, vitamins, and minerals to sustain hair growth. Some teens who are vegetarians also lose their hair if they don’t get enough protein from non-meat sources. And some athletes are at higher risk for hair loss because they may be more likely to develop iron-deficiency anemia.
* Disruption of the hair growth cycle. Some major events can alter the hair’s growth cycle temporarily. For example, delivering a baby, having surgery, or getting anesthesia can temporarily stop the hair growth cycle. (Because the hair we see on our heads has actually taken months to grow, a person may not notice any disruptions of the hair growth cycle until months after the event that caused it.) This type of hair loss corrects itself.
* Male-pattern baldness. Among adults, particularly men, the most common cause of hair loss is androgenetic (pronounced: an-druh-juh-neh-tik) alopecia, also called male-pattern baldness. This condition is caused by a combination of factors, including hormones called androgens and genetics. In some males, the hair loss can start as early as the mid-teen years. It can also occur in guys who take steroids like testosterone to build their bodies.

What Can Doctors Do?

If you see a doctor about hair loss, he or she will check your scalp and, in some cases, may take hair samples. You may also be tested for certain medical conditions that can cause hair loss.

If medication is causing hair loss, ask the doctor if a different drug can be substituted. If your hair loss is due to an endocrine condition, like diabetes or thyroid disease, proper treatment and control of the underlying disorder is important to reduce or prevent hair loss. Using a product like minoxidil that can discourage hair loss and speed up hair growth also may be helpful. Alopecia areata can be helped by treatment with corticosteroids. And if a doctor finds that nutritional deficiencies are causing your hair loss, he or she may refer you to a dietitian or other nutrition expert.
Catastrophic Hair Loss

Hair loss can be the first outward sign that a person is sick, so it may feel scary. Teens who have cancer and lose their hair because of chemotherapy treatments go through a difficult time, especially girls.

It can help to feel like you have some control over your appearance when you’re losing your hair. Try some of the many options for disguising hair loss such as wearing wigs, hair wraps, hats, and baseball caps. For most teens who lose their hair, the hair does return including after chemotherapy. And hair loss during chemotherapy is usually a sign that the treatment is working to destroy the cancer cells because you can see how it’s working on the good cells (your hair!).
Taking Care of Your Hair

Eating a balanced, healthy diet is important for a lot of reasons, and it really benefits your hair. And don’t forget to treat your hair well. For example, some doctors recommend using baby shampoo, shampooing no more than once a day, and lathering gently. Don’t rub your hair too vigorously with a towel, either. Many hair experts suggest you consider putting away the blow-dryer and air drying your hair instead. If you can’t live without your blow-dryer, try using it on a low heat setting.

Style your hair when it’s dry or damp. Styling your hair while it’s wet can cause it to stretch and break. And try to avoid teasing your hair, which can also cause damage. Finally, be careful when using chemicals such as straighteners or color on your hair.

Reviewed by: Eliot N. Mostow, MD, MPH
Date reviewed: June 2004
Originally reviewed by: Patrice Hyde, MD, and Lee Lucas, LCSW”

http://kidshealth.org/teen/diseases_conditions/skin/hair_loss.html