Hair Loss Myths: Do Hats, Dandruff or Shampoo Cause Hair Loss?

Below, each myth gets its own answer with the source. The page ends with what does cause pattern hair loss, and what treats it.

Myth 1: Do hats cause hair loss?

Not in the way people fear. A normal cap does not choke hair roots or block air. Hair roots get oxygen from the blood, not from the air above the scalp.

The best study on this compared identical twins. Twins share the same genes, so differences between them point to lifestyle. The study enrolled "Ninety-two identical male twins" and asked about habits, then measured hair loss from photos. It found that "Daily hat use (p = 0.050), higher body mass index (p = 0.012), and higher testosterone levels (p = 0.040) were associated with decreased temporal hair loss" (Gatherwright et al. 2013, PubMed). The temples are the sides of the forehead.

That does not mean hats protect your hair. It means the study found no harm. A hat may simply shield the scalp from sun.

There is one real exception: friction and pulling. The American Academy of Dermatology says people "can develop hair loss where boots, socks, or tight clothing frequently rubs against their skin" (AAD: what causes hair loss, read 14 Nov 2026). It also warns that hair "tightly pulled back" can lead to permanent loss. A very tight hat worn all day, every day, could rub. A normal cap is fine.

Myth 2: Does dandruff cause hair loss?

Dandruff does not cause male pattern hair loss. But it may add to shedding, and it may go along with more loss in some men.

The AAD describes dandruff as "a common scalp condition in which small pieces of dry skin flake off of the scalp" (AAD: how to treat dandruff, read 14 Nov 2026). It can make the scalp itch.

The same twin study found "the presence of dandruff (p = 0.028)" was linked to more hair loss at the front of the scalp (Gatherwright et al. 2013, PubMed). A link is not proof that one causes the other.

A 2002 study tested this further. It enrolled 150 men with pattern hair loss, shedding and dandruff. They were put into groups at random to use one of three dandruff shampoos for 6 months. The authors start from the point that "Hair shedding and hair thinning have been reported to be affected by dandruff and seborrhoeic dermatitis" (Piérard-Franchimont et al. 2002, PubMed). Seborrhoeic dermatitis is a stronger, oily form of dandruff. All three shampoos "cleared pruritus and dandruff rapidly". Pruritus means itching. Shedding went down, but hair density did not change.

So treating dandruff can calm shedding. It will not reverse pattern loss on its own.

Myth 3: Does Head and Shoulders cause hair loss?

No study we found shows that it does. The label does not list hair loss either. Head and Shoulders Dry Scalp Care is a drug product with "Pyrithione zinc 1%" as its active ingredient, used to help "prevent recurrence of flaking and itching associated with dandruff" (DailyMed: Head and Shoulders Dry Scalp Care label, read 14 Nov 2026). Its warnings say to avoid the eyes and to stop if the "condition worsens or does not improve". Hair loss is not on it.

The one trial of pyrithione zinc shampoo on hair growth points the other way. It ran for 6 months in 200 men with pattern hair loss. It found a rise in hair counts for "the 1% pyrithione zinc shampoo, the 5% minoxidil topical solution, and the combination treatment groups relative to the placebo shampoo" (Berger et al. 2003, PubMed). A placebo shampoo is a dummy shampoo, like a sugar pill, with no drug in it. The gain was small: "slightly less than half that for the minoxidil topical solution".

Why do some men blame it? Men often start a dandruff shampoo when they notice flakes and shedding. If pattern loss is starting at the same time, the shampoo takes the blame.

Myth 4: Washing your hair often makes it fall out

Washing does not cause hair loss. You see more hairs in the drain because loose hairs that were already shed come out in the water. The AAD says, "It's normal to shed between 50 and 100 hairs a day" (AAD: hair loss or hair shedding?). If you wash less often, more of those hairs come out at once.

Harsh care can break hair, though. The AAD advises men with thinning hair to "Use a gentle shampoo" and to apply conditioner after each wash (AAD: hair loss tips).

Myth 5: Baldness only comes from your mother's side

The genetics are not that simple. MedlinePlus says "The inheritance pattern of androgenetic alopecia is unclear, because many genetic and environmental factors are likely to be involved" (MedlinePlus: androgenetic alopecia, read 14 Nov 2026). Androgenetic alopecia is the medical name for male pattern hair loss. It adds that having "a close relative with patterned hair loss appears to be a risk factor". That relative can be on either side.

Myth 6: Bald men have more testosterone

Not quite. Pattern hair loss is tied to DHT, a hormone made from testosterone, and to how sensitive your hair roots are to it. MedlinePlus says gene changes may make the hair's hormone receptors "more easily stimulated by androgens than normal". In the twin study, higher testosterone was linked with less loss at the temples, not more.

What does cause pattern hair loss

Pattern hair loss comes from genes and DHT. The AAD calls hereditary hair loss "the most common cause of hair loss worldwide". It also says, "Without treatment, you will continue to lose hair." Other real causes, such as stress shedding, thyroid problems and low iron, are covered in our guide to what causes hair loss in men.

What treats it

Two drugs have the strongest record. Finasteride is an FDA-approved pill that lowers DHT. Minoxidil foam is approved over the counter for the crown. The cheapest hair loss plan we track is Keeps at $14 a month, checked November 14, 2026, and Keeps lists minoxidil foam at $8.92 a month. Our male pattern baldness treatment guide covers each option. Every program, scored on price and care, is on the best online hair loss programs.