A few years ago, telehealth was the "nice to have" tab on a clinic's website. Today it's the front door. Patients book a video call before they book a clinic visit, and a growing number never set foot in a physical waiting room at all. But behind the smooth patient experience, building an actual online telehealth service is messier than most "we built it in a weekend" threads make it sound. I've been deep in this space for a while now, and wanted to share what actually matters when you're building one — beyond the surface-level pitch. What "telehealth" really covers The word gets used loosely. In practice, online telehealth services fall into four buckets: Synchronous video visits — live doctor-patient calls, the most visible part. Asynchronous care — patients send symptoms, photos, or messages; a clinician replies within hours. Remote patient monitoring (RPM) — connected devices streaming data to a clinician dashboard. Store-and-forward — images, scans, or reports sent to a specialist for review.…