What causes hair loss on the top of the head?

Generally, hair loss on the top of the scalp may be related to factors such as aging, hormonal changes, alopecia areata, androgenetic alopecia, and iron-deficiency anemia. It is recommended to seek timely medical evaluation to identify the underlying cause and receive appropriate treatment under the guidance of a qualified physician. Specific analyses are as follows:

1. Aging

With advancing age, the function of scalp hair follicles gradually declines, potentially leading to follicular atrophy, shortened hair growth cycles, and finer, shorter new hair, ultimately resulting in hair loss on the crown. Maintaining a healthy lifestyle—including balanced nutrition and moderate physical activity—can help support overall physical and mental well-being.

2. Hormonal Changes

Poor lifestyle habits such as chronic sleep deprivation, lack of exercise, and unbalanced diet may disrupt the normal function of the endocrine system, causing fluctuations in hormone levels that could trigger hair loss on the top of the head. Establishing regular sleep patterns, engaging in moderate exercise, and maintaining a balanced diet can help regulate and stabilize hormonal balance.

3. Androgenetic Alopecia

Androgenetic alopecia is commonly caused by a combination of genetic predisposition and unhealthy lifestyle factors. It involves the binding of androgens to receptors in scalp hair follicles, which may lead to follicular miniaturization and a shortened hair growth cycle, resulting in significant hair loss on the crown. This condition may also be accompanied by oily hair and increased dandruff. Treatment options include hair transplantation surgery, which involves surgically redistributing residual healthy hair from donor areas of the scalp to balding or thinning regions, thereby improving the appearance of hair loss or reshaping hair distribution.

4. Alopecia Areata

Alopecia areata is triggered by an abnormal immune response in which the body mistakenly attacks hair follicles as if they were foreign threats. This autoimmune reaction can severely disrupt the normal hair growth cycle, leading to hair loss on the scalp. Symptoms may also include thin, brittle, and easily broken hair. Patients may be prescribed medications such as mometasone furoate cream, triamcinolone acetonide urea cream, or cyclosporine soft capsules according to medical advice.

5. Iron-Deficiency Anemia

Iron deficiency leads to iron-deficiency anemia, impairing red blood cell production and the blood’s ability to transport oxygen. This reduces oxygen supply to scalp hair follicles and may result in hair loss on the crown. Additional symptoms may include fatigue, pallor, and palpitations. Under professional medical supervision, treatment may involve iron supplements such as iron dextran tablets, ferrous gluconate tablets, or protein succinate iron oral solution.

Maintaining a healthy lifestyle—including balanced nutrition, regular sleep patterns, and moderate physical activity—can help prevent and improve hair loss issues.