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6. Chiropractors

Somehow, chiropractors have managed to sneak into a semi-respectable place in people's minds, somewhere between physiotherapists and osteopaths. There is, however, very little scientific backing to the practice.
Chiropractors generally focus on spinal manipulation and will, basically, crack your bones to cure everything from arthritis to asthma. Even those who are aware of its pseudoscientific status tend to think of the practice as mostly harmless and many chiropractors claim that their methods are 100% safe.
It turns out that this is a falsely positive picture born out of a massive underreporting in negative side effects. In reality, a whopping 50% of patients experience adverse side effects from a session of bone cracking.
These can be mild symptoms such as pain or swelling at the treatment site, but in some cases, the extreme manipulation of the neck can lead to nerve damage or even have the arteries disintegrate, causing stroke.