There is no fastest and most effective way to regrow hair, and treatment is based on the cause of hair loss. The general causes of massive hair loss include ringworm of the head, baldness, seborrheic alopecia and so on. 1. Ringworm of the head: ringworm of the head is usually caused by fungal infections, in the treatment of which it is recommended to remove the hair, you can take anti-fungal drugs such as terbinafine orally, and you can also use naftifine ketoconazole cream externally. 2. Patchy baldness: the formation of patchy baldness is related to mental and immune factors, and can be treated with topical minoxidil ointment, or topical glucocorticosteroids or injections to inhibit immune reactions around the hair follicles. 3. Seborrheic alopecia: Seborrheic alopecia may be related to heredity, androgen, etc. In the treatment, oral finasteride (for men) or spironolactone (for women) can be taken, and topical selenium disulphide lotion, minoxidil application, etc. After the condition is stabilized, hair transplantation is feasible. For patients who need fast hair regrowth, it is recommended that they go to the hospital in time to clarify the cause of the disease and carry out standardized treatment under the guidance of professional doctors.