Keeping your hair starts with understanding why it falls out in the first place, then targeting those causes with the right combination of nutrition, habits, and (if needed) treatment. Most hair loss is gradual and driven by genetics, but a surprising amount is caused or worsened by factors you can control: stress, diet, and how you physically treat your hair day to day.
Why Hair Falls Out
The most common form of hair loss is pattern baldness, which affects both men and women. It’s driven by a hormone called DHT, a byproduct of testosterone. DHT binds to receptors in genetically susceptible hair follicles and causes them to shrink over time. As follicles miniaturize, the active growth phase of each hair gets shorter and the resting phase gets longer. Eventually, the follicle produces only fine, nearly invisible hairs, or stops producing hair altogether.
This process is gradual. In men, it typically starts with recession at the temples and thinning at the crown. In women, it usually appears as overall thinning along the part line while the hairline stays intact. Catching it early matters because miniaturized follicles are much harder to revive than ones that are just starting to shrink.
Fix Nutritional Gaps First
Iron deficiency is one of the most overlooked causes of hair shedding, especially in women. In one study, women experiencing diffuse hair loss had average ferritin (iron storage) levels of about 15 ng/mL, compared to 60 ng/mL in women with no hair loss. Low vitamin D levels show a similar pattern: women with thinning hair averaged around 14 ng/mL of vitamin D, versus 17 ng/mL in controls.
If your hair is thinning diffusely rather than in a specific pattern, getting your ferritin and vitamin D levels checked is a practical first step. Iron-rich foods include red meat, lentils, spinach, and fortified cereals. Vitamin D comes from sun exposure, fatty fish, and fortified dairy. In many cases, supplements can help close the gap, but a blood test tells you whether deficiency is actually part of your problem or not.
Protein also matters. Hair is made almost entirely of a protein called keratin, and your body will deprioritize hair production when protein intake drops too low. Crash diets and very restrictive eating patterns are common triggers for temporary but dramatic shedding.
Manage Stress-Related Shedding
Stress doesn’t just feel like it causes hair loss. It literally does. A condition called telogen effluvium occurs when a physical or emotional stressor pushes a large percentage of your hair follicles into the resting phase all at once. Normally, only about 10% of your hair is resting at any given time. After a major stressor, up to 70% can shift into that phase simultaneously.
The tricky part is the delay. Hair loss from stress typically shows up two to three months after the triggering event, which makes it hard to connect cause and effect. Common triggers include surgery, severe illness, childbirth, significant weight loss, a major life upheaval, or prolonged emotional stress.
The good news: telogen effluvium usually resolves on its own within three to six months. After the shedding period ends, new growth appears in the affected areas. The key is addressing the underlying stressor and making sure you’re not compounding the problem with poor nutrition or harsh hair practices during recovery.
Stop Damaging Your Hair Physically
Traction alopecia is hair loss caused by repeated pulling on the follicles. It’s entirely preventable and entirely caused by styling choices. The American Academy of Dermatology identifies several high-risk styles: tight cornrows, locs, tightly pulled buns and ponytails, hair extensions or weaves (especially on chemically relaxed hair), and sleeping in rollers regularly. Even the constant friction from a hat or head scarf worn daily can contribute.
The fix is straightforward: rotate your hairstyles so follicles get time to recover. After wearing cornrows or tight braids, switch to loose styles or go natural for a few months. Keep braids in for no longer than six to eight weeks at a stretch. If a style hurts or creates visible tension at the hairline, it’s too tight. Traction alopecia is reversible in its early stages, but years of repeated damage can destroy follicles permanently.
Heat styling, aggressive brushing, and chemical treatments (bleaching, perming, frequent coloring) also weaken hair shafts and contribute to breakage. Minimizing heat exposure and using lower temperature settings makes a real difference over time.
Treatments That Slow or Reverse Hair Loss
Two FDA-approved medications form the backbone of hair loss treatment. Minoxidil is a topical solution (available in 2% and 5% concentrations) applied directly to the scalp. It works by increasing blood flow to follicles and extending the growth phase of the hair cycle. It’s available over the counter and used by both men and women. Results typically take three to six months of consistent daily use to become visible, and the benefits reverse if you stop.
Finasteride is a prescription pill that blocks the enzyme responsible for converting testosterone into DHT. By reducing DHT levels, it slows follicle miniaturization and can partially reverse it. It’s primarily prescribed for men. A topical version of finasteride is gaining attention because it delivers the drug directly to the scalp with less absorption into the bloodstream, which appears to reduce the risk of systemic side effects compared to the oral form.
These treatments work best when started early, before follicles have fully miniaturized. Someone at the first signs of thinning will generally see better results than someone who has had visible baldness for years.
Red Light Therapy for Hair Growth
Low-level laser therapy (sometimes called red light therapy) is a newer option with growing clinical support. It works by stimulating cellular energy production in hair follicles. The effective wavelengths fall into four ranges: 614 to 624 nanometers, 668 to 684 nanometers, 751 to 772 nanometers, and 813 to 846 nanometers. These span from visible red light into the near-infrared range.
Home devices (laser caps and helmets) have made this more accessible. Some require sessions as brief as six minutes per day. The International Society of Hair Restoration Surgery recognizes the approach as having clinical evidence behind it, though results vary and it’s generally considered a complement to other treatments rather than a standalone solution.
Daily Habits That Protect Your Hair
Beyond specific treatments, several everyday habits reduce unnecessary hair loss. Sleep on a silk or satin pillowcase to minimize friction. Avoid brushing wet hair aggressively, since hair is most fragile when saturated. Use a wide-tooth comb instead. Wash your hair regularly enough to keep the scalp healthy, but not so frequently that you strip natural oils. For most people, every two to three days works well.
Scalp health matters more than people realize. A buildup of oil, product residue, or inflammation can impair follicle function. Gentle, sulfate-free shampoos clean without over-stripping. If you notice persistent itching, flaking, or redness, treating the underlying scalp condition often improves hair retention.
Finally, smoking constricts blood vessels that supply the follicles, and excessive alcohol intake can interfere with nutrient absorption. Both habits accelerate hair thinning over time. Quitting smoking and moderating alcohol are two of the simplest, most impactful changes for long-term hair health.