Nine common beliefs about hair loss. Here's the bald truth:

[HAMILROCK]

I figure some of you in here have a fear of balding....

Myth: Hair loss is passed down from your mother's side.

Not entirely true. While the primary baldness gene is on the X chromosome, which men get only from their mothers, other factors are also in play. The hereditary factor is slightly more dominant on the woman's side, but research suggests that men who have a bald father are more likely to develop male pattern baldness than those who don't.

Myth: If you're balding, you're old.

On the contrary, hair loss can strike in the teens and is common among 20- and 30-year-olds. The earlier it begins, the more severe it will likely become.

Myth: Wearing a hat strains hair follicles, causing hair to fall out.

Good news for men who rely on caps to cover their shiny crowns: They're not causing any harm. Dirty hats can, however, lead to a scalp infection, which in turn accelerates hair loss, so either make sure yours is clean or rotate frequently.

Myth: Trauma can cause hair loss.

True--with a catch. Physical or emotional stress "will never cause you to lose hair you wouldn't have lost anyway," Hitzig says. "If the hair is not meant to be lost, it will grow back." That said, it can accelerate balding. Rapid shifts in weight--whether pounds are gained or lost--can also contribute to the likelihood of hair loss.

Myth: Treatments like Propecia and Rogaine can prevent hair loss.

True. "Propecia is probably the most important advance in hair loss therapy in the last several decades," says Neil Sadick, a clinical professor in the department of dermatology at the Weill Cornell Medical College. That prescription pill, which reduces levels of a hormone that shrinks hair follicles, works best in younger people whose hair is just beginning to thin. In addition to stalling the process, about one-third of men on Propecia will see some hair regrowth. But it's not the only option: Rogaine (also known as minoxidil), a topical treatment applied directly to the scalp, also helps slow hair loss. But both drugs come with drawbacks. Propecia can reduce libido, or sex drive, in men, while Rogaine must be applied twice daily and can irritate the scalp.

Myth: If you want to hang onto your hair, stay away from gel and hairspray.

No need to forgo the products--they don't cause balding, and neither does shampoo, washing your hair frequently, or dandruff. But some men tease their hair and use curling irons, which could speed up the process. "It's the over-mechanical utilization of hair that can be problematic," Sadick says.

Myth: Exposure to the sun encourages balding.

Not true. Tanning beds also don't have an effect.

Myth: Loading up on carbohydrates can lead to hair loss.

Carbohydrates and red meat provide nutrients that are helpful for maintaining a full head of hair, says Wilma Bergfeld, a dermatologist at the Cleveland Clinic. Bergfeld's past research suggests that iron deficiency may be closely linked to hair loss. Treatment--like taking iron supplements--could restore growth.

Myth: The most sexually active men are the first to go bald.

This is one of the most popular myths Sadick hears from patients. Relax, he says--there's no truth to it. Research has also found that men who bald do not have more testosterone than their hairier friends.

[Fishhead]

Baldness is inherited, plain and simple.