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Hair is more than appearance; it is often an early sign of what is happening inside the body. Sudden shedding, thinning or a dry, itchy scalp can reflect stress, nutrition, hormones or styling habits. Understanding how hair grows helps you know what to expect and what you can change.

How Hair Grows

Each hair follicle goes through a cycle:

• Anagen (growth): lasts about 2 to 7 years on the scalp. Around 85 to 90 percent of hairs are in this phase at any time.
• Catagen (transition): a short phase of about 2 to 3 weeks.
• Telogen (resting): lasts about 3 months, after which the hair sheds and a new one starts growing.

Shedding 50 to 100 hairs a day is considered normal. Scalp hair grows roughly 1 cm (about half an inch) per month.

Common Causes of Hair Shedding and Thinning

Telogen effluvium

A major stressor, such as illness, high fever, surgery, childbirth, crash dieting or severe emotional stress, can push many hairs into the resting phase at once. Noticeable shedding usually starts about 2 to 3 months later and often recovers within 6 months once the trigger resolves. Read our chronic stress guide.

Pattern hair loss (androgenetic alopecia)

The most common cause of gradual thinning in both men and women, influenced by genetics and hormones. Effective treatments exist; early advice from a dermatologist helps.

Nutritional deficiencies

Low iron, protein, vitamin D and zinc have been associated with hair shedding.

Thyroid problems

Both underactive and overactive thyroid can cause diffuse thinning; see our iodine and thyroid guide.

Hormonal changes

After pregnancy and around menopause; see our menopause guide.

Styling damage

Tight hairstyles (traction alopecia), frequent heat styling, bleaching and harsh chemical treatments damage hair and follicles.

Scalp conditions

Dandruff, seborrhoeic dermatitis and psoriasis can cause itching and inflammation.

Autoimmune conditions

Alopecia areata causes round patches of hair loss and needs medical assessment.

Nutrition for Healthy Hair

Protein

Hair is made mostly of keratin, a protein. Very low protein intake can cause thinning. Include fish, eggs, dairy, legumes, tofu, nuts or meat at each meal.

Iron

Low iron stores (measured by ferritin) are commonly linked to hair shedding, especially in women with heavy periods. Iron-rich foods include red meat, lentils, beans, spinach and fortified cereals; eat them with vitamin C to improve absorption. Do not take iron supplements without testing, as excess iron is harmful.

Zinc

Found in oysters, meat, pumpkin seeds and chickpeas.

Vitamin D

Low vitamin D has been associated with several types of hair loss; see our vitamin D guide.

Omega-3 fats

Support the scalp's skin health; see omega-3 vs omega-6. Oily fish and fermented cod liver oil are traditional sources.

Biotin

Often marketed for hair, but true biotin deficiency is rare, and there is little evidence it helps people who are not deficient. High-dose biotin can also interfere with some lab tests, including thyroid and heart tests, so tell your doctor if you take it.

Vitamin A balance

Too much vitamin A can actually cause hair loss; see our vitamin A guide.

Scalp Care Habits

1. Wash as often as your scalp needs: oily scalps may need daily washing; dry or curly hair may prefer less often.
2. Massage while shampooing: gentle fingertip massage feels good and stimulates circulation. A small 2016 Japanese study reported increased hair thickness with daily standardised scalp massage, though more research is needed.
3. Use conditioner on lengths, not necessarily the scalp.
4. Rinse thoroughly to avoid product build-up.
5. Treat dandruff with medicated shampoos containing ketoconazole, zinc pyrithione or selenium sulfide.
6. Protect your scalp from sun with a hat; see our sun safety guide.

Gentle Styling

• Use the lowest effective heat and a heat protectant.
• Air dry when possible.
• Avoid very tight ponytails, braids and extensions.
• Use a wide-tooth comb on wet hair, which is more fragile.
• Sleep on a smooth pillowcase to reduce friction.

A Note on Essential Oils for Hair

Small studies have explored rosemary oil and peppermint oil for hair growth. Results are interesting but limited. If you try oils on your scalp, always dilute them in a carrier oil, patch test first, and keep them away from your eyes; see our essential oil safety guide.

When to See a Doctor

• Sudden or patchy hair loss
• Hair loss with scalp pain, redness or scaling
• Shedding lasting more than six months
• Hair loss with fatigue, weight changes or irregular periods

Blood tests for iron (ferritin), thyroid function and vitamin D are often helpful.

Frequently Asked Questions

How long does it take to see results from changes?

Because hair grows slowly and new hairs take months to appear, allow at least three to six months to judge any change.

Does cutting hair make it grow faster?

No. Trimming removes split ends and makes hair look healthier, but growth happens at the follicle in the scalp.

The Takeaway

Healthy hair starts with a healthy body: adequate protein, iron, zinc and vitamin D, stress management and gentle styling. Be patient; hair grows slowly, and changes take months to show.

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• Korean Collagen Ampoules and Skin Aging

Disclaimer: This article is for general educational purposes only. These statements have not been evaluated by the Food and Drug Administration. Live Pine products are not intended to diagnose, treat, cure or prevent any disease. Always consult a qualified healthcare professional before starting a new supplement, especially if you are pregnant, nursing, taking medication or managing a health condition.