What causes hair loss?

Male- and female-pattern hair loss (genetic)

The most common cause by far. Androgenetic alopecia is driven by genetics and the hormone DHT, which gradually shrinks follicles. Men see a receding hairline and crown thinning; women see diffuse thinning along the part. It's progressive, so treating it earlier saves more hair. See the proven treatments.

Telogen effluvium (stress shedding)

A temporary, heavy shed that shows up a few months after a shock — serious stress, illness, surgery, childbirth, or rapid weight loss. It usually resolves on its own once the trigger has passed.

Thyroid and hormonal changes

An under- or over-active thyroid, pregnancy, menopause, or stopping birth control can all cause shedding. A blood test is worth it, since treating the root issue often brings the hair back.

Nutritional gaps

Low iron (ferritin), vitamin D, zinc, or protein can thin hair — crash diets are a frequent trigger. Fixing the deficiency usually helps.

Medications

Blood thinners, certain antidepressants, beta-blockers, retinoids, and chemotherapy can all cause hair loss. Don't stop a prescribed drug without checking with your doctor first.

Alopecia areata (autoimmune)

Here the immune system attacks follicles, leaving round, patchy bald spots. It's separate from pattern loss and needs a dermatologist's diagnosis and care.

Traction alopecia

Caused by tight styles — buns, braids, extensions, ponytails — pulling on follicles over time. Caught early it reverses; sustained tension can scar and permanently damage follicles.

Scalp conditions

Fungal infections (ringworm), severe seborrheic dermatitis, or psoriasis can cause shedding or breakage. Treating the scalp condition clears up the loss.

Aging

Apart from pattern baldness, hair naturally thins and grows more slowly with age as follicles wind down.

Which cause is it?

Genetic loss is gradual and follows a set shape; sudden or patchy loss usually means something else. If you're not sure — or the shedding is fast, patchy, or comes with other symptoms — see an Omaha clinic or dermatologist to pin down the cause before starting treatment. For genetic thinning, the proven treatments and a transplant are the main routes.