The hair on the top of the head is soft and fine, while the hair on the sides is coarse.

Under normal circumstances, soft and fine hair on the top of the scalp with coarser hair on the sides may be related to factors such as genetics, improper hair care, malnutrition, seborrheic alopecia, or hypothyroidism. Patients should promptly visit a reputable medical facility to determine the underlying cause and receive appropriate treatment. Specific analysis is as follows:

1. Genetic Factors

If family members or parents themselves have soft, fine hair on the crown and coarser hair on the sides, individuals may inherit this trait and exhibit the same pattern. This condition is generally considered normal and does not require special treatment.

2. Improper Hair Care

Frequent perming or dyeing can damage the hair shaft and even harm hair follicles, leading to the aforementioned condition. Some patients may also experience dry, frizzy, and brittle hair that breaks easily. It is recommended to maintain proper hair care by avoiding frequent chemical treatments, using non-irritating shampoos, and applying conditioner after shampooing to nourish the hair.

3. Malnutrition

Excessive picky eating or unbalanced diets may lead to insufficient nutrient intake, including deficiencies in vitamins and trace elements such as vitamin E, iron, and zinc. Prolonged nutritional deficiency may result in the described hair issues. It is advised to develop healthy lifestyle habits, maintain a balanced diet, and consume more protein-rich foods such as lean meat, eggs, and milk.

4. Seborrheic Alopecia

Irregular eating habits, chronic sleep deprivation, excessive alcohol consumption, or prolonged stress may lead to elevated androgen levels, resulting in seborrheic alopecia. If left untreated, this condition can worsen and lead to significant hair thinning and loss. Patients are advised to correct unhealthy behaviors—such as maintaining regular meal times and sleep schedules, avoiding late nights and alcohol—and manage stress. When necessary, medications such as finasteride tablets, minoxidil solution, or spironolactone tablets may be used under medical supervision.

5. Hypothyroidism

Hypothyroidism may result from iodine deficiency or overuse of anti-thyroid medications, leading to reduced metabolic function and inadequate nutrient supply to scalp hair follicles. This can cause hair to become fine, soft, and sparse, contributing to the symptoms described. Treatment may include medications such as levothyroxine sodium tablets, thyroid tablets, or hydrocortisone tablets, as prescribed by a physician.

In daily life, patients should pay attention to scalp hygiene and avoid using irritating shampoos to prevent worsening of symptoms.