Hair loss is more common than most people realize. By age 35, roughly two-thirds of men will experience some degree of noticeable hair thinning, and women make up about 40% of those experiencing hair loss. Understanding the cause and stage of your hair loss is the first step toward an effective plan.
Common causes of hair loss
- Androgenetic alopecia (pattern hair loss): the most common cause, driven by genetics and the hormone DHT, which gradually shrinks hair follicles.
- Stress and telogen effluvium: significant physical or emotional stress can push hairs into a shedding phase a few months later.
- Nutritional deficiencies: low iron, vitamin D, zinc, or protein can contribute to thinning.
- Medical conditions: thyroid disorders, autoimmune conditions, and certain medications can trigger hair loss.
- Hairstyling and traction: tight styles that pull on the follicle over time can cause traction alopecia.
Stages of pattern hair loss
Pattern hair loss tends to follow a predictable progression. Catching it early gives you the best chance to keep the hair you have and regrow what's recently thinned.
- Early thinning: a slightly wider part or finer texture, often only noticeable to you.
- Receding hairline: the temples begin to move back, forming an M shape.
- Crown thinning: a bald spot starts to appear at the vertex of the scalp.
- Overall density loss: widespread thinning across the top of the scalp as follicles miniaturize.
When to seek treatment
Because hair follicles that have been dormant for a long time are harder to revive, the earlier you act the better your results tend to be. If you're noticing shedding, a receding hairline, or crown thinning, a doctor consultation can help confirm the cause and match you with an FDA-cleared treatment plan.