How can M-shaped hair loss be reversed?

　　In general, M-shaped alopecia may be caused by genetic factors, aging, malnutrition, endocrine disorders, seborrheic dermatitis, and other factors. It can be treated and improved through methods such as low-level laser therapy, autologous hair transplantation, microneedling therapy, and medication under the guidance of a physician. Detailed explanations are as follows:

　　1. Genetic Factors

　　Individuals with a family history of alopecia and those carrying specific alopecia-related genes may have a higher risk of developing M-shaped alopecia. Patients can undergo low-level laser therapy under the guidance of a physician. This treatment uses low-energy lasers of specific wavelengths to irradiate the scalp, stimulating follicular cell metabolism and proliferation, improving scalp blood circulation, and promoting hair growth. The general reference price for low-level laser therapy is 700-4000 yuan per session. Improvement is usually noticeable 3-6 months after treatment, although possible side effects include skin itching and redness.

　　2. Aging

　　As age increases, bodily functions gradually decline, including reduced vitality of scalp hair follicles. The hair growth cycle changes, with a shortened anagen (growth) phase and prolonged telogen (resting) phase, which may lead to gradual thinning of hair, particularly in the forehead and crown areas, resulting in M-shaped alopecia. Patients can undergo autologous hair transplantation under a physician's guidance. Healthy follicular units are extracted from areas such as the occipital region and then transplanted into the M-shaped balding areas. The transplanted follicles continue to grow in the new area, thereby improving the appearance of hair loss. The general reference price for autologous hair transplantation is 10,000-50,000 yuan per session. Improvement is usually noticeable 3-6 months after surgery, although possible side effects include redness and pain.

　　3. Malnutrition

　　Long-term dietary imbalance and insufficient intake of nutrients such as proteins, vitamins, and minerals may lead to fragile, easily broken, and shedding hair. Patients may also experience dry, lusterless hair. Dietary adjustments should be made in daily life, including increased consumption of foods rich in proteins, vitamins, and minerals. Microneedling therapy can also be performed under a physician's guidance. This treatment uses a microneedle roller to create tiny channels on the scalp, stimulating the scalp's self-repair mechanisms and enhancing the absorption of hair growth medications, thereby stimulating follicular growth. The general reference price for microneedling therapy is 800-3000 yuan per session. Improvement is usually noticeable 3-6 months after treatment, although possible side effects include erythema and edema.

　　4. Endocrine Disorders

　　Factors such as irregular lifestyle and high stress can lead to imbalances in the endocrine system, affecting hormone levels. Elevated androgen levels or decreased estrogen levels may cause hair loss. Patients may also experience symptoms such as menstrual irregularities and mood swings. Treatment under a physician's guidance may include medications such as Xiaoyao Pills, Wuchiyifeng Pills, and Oryzanol Tablets.

　　5. Seborrheic Dermatitis

　　Excessive sebaceous gland secretion, excessive scalp oil production, and Malassezia infection can easily lead to seborrheic dermatitis. Excess oil accumulation on the scalp can block hair follicles, causing inflammation that damages follicular structures and leads to hair loss, accompanied by symptoms such as scalp itching and oiliness. Patients should follow medical advice to use medications such as selenium sulfide shampoo, compound ketoconazole shampoo, and halcinonide solution for treatment.

　　It is recommended to visit a qualified hospital and undergo the above procedures under a physician's guidance to ensure effectiveness and safety. In daily life, one should maintain a balanced diet, ensure sufficient sleep, reduce mental stress, and avoid excessive perming or dyeing of hair.