Whether hair loss can grow again, need to clarify what type of hair loss, in order to scientifically and accurately determine whether it can grow out again. Usually if the hair is naturally shed with metabolism, the hair follicles will grow back after resting for a period of time.1. Physiological hair loss: common postpartum hair loss, senile hair loss, etc. Postpartum hair loss can generally be recovered within six months, and medical intervention is available if necessary. Age-related hair loss is a natural law and basically no longer grows. If you want to regrow hair, you can consult a doctor and choose a suitable means of hair growth, such as hair transplant technology; 2. Pathological hair loss: endocrine disorders, mental stress, bad dietary habits, infections and other factors can easily lead to seborrheic alopecia, baldness or skin diseases of the scalp area, such as lupus erythematosus, lichen planus and scleroderma. When the hair follicle is not damaged, the hair can grow back if it is treated early; if the follicle is more severely damaged, it is usually difficult to grow back. Usually hair loss caused by skin diseases will destroy the hair follicles to a greater extent and the chances of hair re-growth are not as high as in seborrheic alopecia and baldness. The causes of hair loss are complex and it is recommended that treatment be carried out under the guidance of a professional doctor so that the root cause of your hair loss problem can be recognized and most hair loss can grow back through active therapeutic intervention.