Androgenetic alopecia (AGA) is also known as seborrheic alopecia, early baldness, and male pattern baldness (female patients are called women with androgenetic alopecia). Alopecia areata is characterized by a receding frontal hairline and a gradual thinning of hair on the crown of the head, with male subtypes I-VII and female subtypes I-III. Mostly seen in genetics (autosomal dominant or polygenic, with genetic susceptibility and related to androgen levels. Male: about 21-60%, female: about 7-9%), high androgen secretion (increased level of dihydrotestosterone (DHT) in the patient’s hair follicles is the cause of AGA), as well as scalp and serum levels of DHT and increased activity of type II 5-alpha reductase; aromatase and adenylate cyclase have an important role (predominantly in female patients) Hair microscopy, and hair loss characteristics can be diagnosed. However, differential diagnosis is needed with resting alopecia (especially in female patients). Male patients 1-3 degrees to take Bofax 1mg once a day + topical 5% minoxidil tincture, is an effective treatment, need long-term medication, generally 3-5 months to see the effect of treatment, the treatment is mainly to control oil, reduce hair loss, and only later hair growth. Minoxidil tincture can have a fast shedding period, generally 1 month to recover, do not need to be nervous. About 3% of patients have temporary hypogonadism, mostly disappeared in 2-3 weeks, about 0.3% of patients have impotence, so that should stop the drug, men with the use of bofadil generally does not affect fertility. Other treatments include hair growth drugs, red light, UV-AB phototherapy, botulinum toxin head spot injections, etc. For those with more than 4 degrees or forehead “M” alopecia patients with poor results of drug treatment, hair transplantation can be considered. All in all, early treatment should be done and persistent. Female patients do not need to use the Bovacil (basically ineffective) can consider other treatments, women grow hair more difficult. If you have thinning hair on the top of your head, it is recommended to treat it as early as possible.