Alopecia & Hair Loss: Types, Causes & Treatments

“Alopecia” simply means hair loss — from the scalp or anywhere on the body. Alopecia and hair loss can be temporary or permanent, patchy or diffuse, scarring or non-scarring. Some forms are driven by genetics and hormones, others by autoimmune activity, stress, hairstyling habits, or underlying medical conditions. Because the causes are so different, alopecia is best thought of as a category rather than a single disease — which is exactly why a precise diagnosis matters.

Types of Alopecia and Hair Loss

There are several distinct types of alopecia and hair loss, and they fall into two broad groups: non-scarring (often treatable) and scarring (permanent). Here are the most common.

1. Androgenetic Alopecia (Pattern Baldness)

The most common type by far, affecting both men and women. In men it shows as a receding hairline and crown thinning; in women as widening-part diffuse thinning. It’s driven by genetics and the hormone DHT, which gradually shrinks hair follicles. Explore it in detail for men and women. This type is permanent if untreated but responds well to medication and hair transplantation.

2. Alopecia Areata

An autoimmune condition in which the immune system attacks hair follicles, causing sudden, coin-shaped bald patches. In severe cases it can progress to total scalp loss (alopecia totalis) or full-body loss (alopecia universalis). It can affect any age and often comes and goes. Learn more on our alopecia areata page.

3. Telogen Effluvium

A temporary, diffuse shedding triggered when many follicles enter the resting (telogen) phase at once — often after major stress, illness, surgery, childbirth, crash dieting, or thyroid imbalance. The good news: it’s usually reversible once the trigger is addressed. See our guide on telogen effluvium.

4. Traction Alopecia

Caused by repeated tension on the hair from tight ponytails, buns, braids, or extensions. Early on it’s reversible, but prolonged pulling can permanently damage follicles along the hairline and temples. More on traction (tractional) alopecia.

5. Scarring (Cicatricial) Alopecia

A group of rarer conditions where inflammation destroys the follicle and replaces it with scar tissue, causing permanent hair loss. Because the treatment window is narrow, early specialist care is critical. Read about scarring alopecia.

6. Anagen Effluvium

Rapid hair loss during the active growth phase, most often caused by chemotherapy or radiation. It is usually reversible once treatment ends.

While the trigger varies by type, the most common causes of alopecia and hair loss include:

• Genetics and hormones — the main driver of pattern baldness, linked to DHT sensitivity.
• Autoimmune activity — as in alopecia areata.
• Physical or emotional stress — a frequent cause of telogen effluvium.
• Nutritional deficiencies — low iron, vitamin D, protein, or zinc. (See our guides on iron tablets and multivitamins for hair growth.)
• Hormonal changes — thyroid disorders, PCOS, pregnancy, and menopause.
• Hairstyling and chemical damage — tight styles, heat, and harsh treatments.
• Medical conditions and medications — including certain drugs and scalp infections.

Identifying the underlying cause is what separates effective treatment from wasted money on products that were never going to work.

A dermatologist diagnoses alopecia and hair loss through a combination of:

1. Medical history — onset, pattern, family history, recent stress, illness, or medication.
2. Scalp and hair examination — often using a dermatoscope to inspect follicles closely.
3. Pull test — gently tugging a small section to assess active shedding.
4. Blood tests — to check iron, thyroid, vitamin D, and hormone levels.
5. Scalp biopsy — occasionally needed to confirm scarring alopecia or rule out other conditions.

An accurate diagnosis from a qualified hair-loss specialist is the foundation of any successful treatment plan.

Treatment for alopecia and hair loss depends entirely on the type and stage. The main proven options are:

Medications

• Minoxidil — a topical (and low-dose oral) treatment that prolongs the growth phase and is effective for pattern baldness and some diffuse loss. See minoxidil.
• Finasteride — an oral DHT-blocker for male pattern baldness. See finasteride.
• Corticosteroids — injections or topicals used to calm the immune response in alopecia areata.

Regenerative Therapies

• PRP (Platelet-Rich Plasma) — your own growth factors injected into the scalp to stimulate follicles. Learn about PRP therapy for hair loss.
• GFC (Growth Factor Concentrate) — a next-generation version of PRP. See GFC treatment.
• Low-Level Laser Therapy (LLLT) — light therapy that supports follicle activity.

For permanent pattern baldness — and stable, non-active cases — a hair transplant is the only way to restore hair in bald areas. It relocates your own DHT-resistant follicles to thinning zones for natural, lasting results. (Women’s options here.) Note that transplants are not suitable for active autoimmune or scarring alopecia until the condition is controlled — another reason diagnosis comes first.

Important: Temporary types like telogen effluvium and early traction alopecia often regrow on their own once the cause is removed — no surgery needed. Don’t rush into expensive procedures before getting a proper diagnosis.

Some types — like genetic pattern baldness — can’t be fully prevented, but their progression can often be slowed, and many other forms of alopecia and hair loss are avoidable. Practical steps include:

• Eat for your hair — a protein-rich diet with adequate iron, zinc, vitamin D, and biotin. Deficiencies are a common, fixable cause of shedding.
• Manage stress — since chronic stress is a leading trigger of telogen effluvium, sleep, exercise, and stress control genuinely matter.
• Be gentle with styling — avoid tight ponytails, braids, and extensions that pull on the roots, and limit heat and harsh chemical treatments.
• Treat the scalp — keep dandruff and inflammation under control, as a healthy scalp is the foundation for healthy hair.
• Act early — the single most effective “prevention” is catching hair loss early. Most treatments protect existing follicles far better than they regrow long-lost ones.

Book a consultation if you notice sudden bald patches, rapid or unusual shedding, a widening part, scalp redness or scarring, or hair loss alongside other symptoms. The earlier alopecia and hair loss are assessed, the more treatment options you’ll have — and for scarring types, early action can prevent permanent loss.

At Alloroots, every diagnosis and treatment plan is led by MD dermatologists and hair-restoration surgeons who are AIIMS (New Delhi) alumni. From medical management and regenerative therapies to advanced Bio-Enhanced FUE hair transplants with a 90%+ graft survival rate, we treat every type of alopecia and hair loss with a plan tailored to you — not a one-size-fits-all package. See real before-and-after results or book a free consultation to find out which treatment is right for you.