I would like to know about the hair loss treatment cycle and effectiveness.

I became interested in scalp care because I noticed hair falling out when washing and drying my hair. In particular, when I look at photos of the crown of my head, my scalp seems a bit more visible than before, so I am planning to get a consultation in advance. I understand that hair loss treatment methods vary depending on the progression and cause, so I am wondering when it is appropriate to start treatment. I would also like to know if a single session is sufficient or if consistent treatment is necessary. For those who have actually received treatment, I am curious how long it took to see results and how often you scheduled your treatments. I am also looking into the cost, as it likely varies depending on the type of procedure and the number of sessions. If the treatment involves direct application to the scalp, I am also curious about the level of pain or irritation involved. I would appreciate it if those considering hair loss treatment could share their experiences, including the criteria they used to make their choice and their satisfaction with the treatment's effectiveness.