If it feels like head spas are suddenly everywhere, that's not just a feeling. The #headspa hashtag has crossed 2 billion views on TikTok, and search interest in "Japanese head spa" specifically is up roughly 180% year over year. This isn't a niche wellness trend anymore, it's a real, measurable shift in how people think about scalp care. Here's what's actually behind the numbers, and what's worth knowing before you book one based on a video alone. THE NUMBERS BEHIND THE TREN