What causes hair to fall out but not grow back?

Hair loss without regrowth is usually caused by factors such as aging, seasonal changes, mental stress, nutritional deficiencies, or scalp infections. If discomfort occurs, it is recommended to seek medical attention promptly. Specific causes are analyzed as follows:

1. Aging

As people age, the hair follicle growth cycle gradually shortens, hair growth slows down, and the rate of hair shedding may accelerate. Maintaining a healthy lifestyle, balanced diet, and using hair care products containing ingredients such as biotin and vitamin E can help promote scalp health.

2. Seasonal Changes

In autumn and winter, dry weather and temperature fluctuations may reduce sebum secretion on the scalp, affecting hair growth. Use moisturizing shampoos and conditioners regularly to keep the scalp clean and minimize irritation.

3. Mental Stress

Psychological stress can lead to excessive secretion of stress hormones, disrupting the hair growth cycle and pushing hair into the resting phase, resulting in hair loss. Managing stress through exercise, meditation, and counseling can be beneficial.

4. Nutritional Deficiencies

Long-term irregular eating habits and unbalanced diets may lead to nutritional deficiencies. Hair requires adequate nutrients to grow, and insufficient nutrition can hinder hair growth, possibly accompanied by symptoms such as dry skin and brittle nails. Treatment under medical supervision may include medications such as compound vitamin B tablets, ferrous gluconate tablets, and folic acid tablets.

5. Scalp Infections

Infections caused by fungi or bacteria can disrupt the scalp environment and impair hair growth, often accompanied by symptoms like scalp itching and increased dandruff. Treatments may include ketoconazole shampoo, griseofulvin tablets, or mupirocin ointment, used as directed by a physician.

In daily life, maintaining good living habits, ensuring sufficient rest and sleep, eating a balanced diet, and consuming adequate nutrients—especially foods rich in protein, vitamins, and minerals—can support healthy hair growth.