Is it better to start hair loss treatment early?

I am worried because it seems like I am losing more hair than before when washing or drying it. At first, I thought it might be due to the season, but it still bothers me even after some time has passed. I don't think it is serious yet, but I am wondering if I should look into hair loss treatment before it progresses further. I searched online and found that there are various treatment methods, such as oral medication, topical products, and scalp care. I am not sure where to start. Rather than just buying products blindly, wouldn't it be better to first identify the cause at a clinic? I am also curious about how long I would need to manage the treatment once I start. Since it seems like there will be ongoing costs, I would like to find out in advance. For those who have received hair loss treatment, what tests or guidance did you receive? Please let me know if there are any points that are good to check early on.