If you were the child who could fold into positions that made other people wince, who was called clumsy, who got lightheaded standing up too fast, and who was later assessed for autism or ADHD, you may have wondered whether any of it was connected.

If you have ever woken up, reached for your phone before your feet touched the floor, read a two-digit number, and let it decide whether today would be a good day or a careful one, you know how quickly a wearable starts running your morning.

If your child wins the flexibility test at every practice and has now started saying a knee feels wobbly or a shoulder slipped, this is worth understanding rather than panicking about.

If your teenager has stood up and had to grab the doorframe, gone gray in a hot shower, or told you the classroom went swimmy—you have probably already been told it is growth, or dehydration, or exam stress.

If you’ve ever popped a shoulder out of place reaching into the back seat, felt your kneecap slide carrying laundry upstairs, rolled an ankle stepping off a curb you had already seen, or been the person who could bend a thumb to their forearm, you may be living with joint hypermobility.

If you’ve ever felt your heart pound while blow-drying your hair, gone dizzy waiting for the coffee to brew, needed to sit down halfway through the dishwasher, or found that ten minutes in a grocery line costs you the afternoon, you may be living with the exercise intolerance that comes with POTS. If someone has told you exercise is the treatment, you have probably already tried—and it is possible that trying is what put you on the couch for three days.