Risk to Those With Cardiovascular Issues People with high blood pressure and/or heart conditions are warned not to ride roller coasters because of the way they tax the cardiovascular system.

You should avoid riding roller coasters if you have certain pre-existing medical conditions that could be aggravated by the extreme gravitational forces (G-forces), rapid acceleration, or sudden directional changes. Amusement parks explicitly warn individuals with heart conditions, high blood pressure, or a history of strokes to stay off thrill rides, as the adrenaline surge and physical stress can trigger cardiac events. Pregnant women are advised not to ride due to the risk of placental abruption or other complications from the jarring motions. Furthermore, if you suffer from chronic back or neck problems, such as herniated discs or recent spinal surgery, the intense "whiplash" effect can cause severe injury or pain. Those prone to motion sickness, vertigo, or seizures may also find the sensory overload and flashing lights dangerous. It is also a bad idea to ride if you have consumed alcohol or drugs, are severely dehydrated, or if you have inner ear infections that affect balance. If a ride has height or weight restrictions, or if you cannot properly secure the safety harness, you must not ride, as these constraints are engineered specifically to prevent falls and ensure the safety systems function correctly.