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Yes, a spa can hurt you.Jets that are too strong can be worse than going to a Shiatzu massage specialist. Accupressure in the wrong areas may stimilate nerves in a negative way. This is why most manufacturers have adjustability so you can control the water pressure with air controls. Other ways a spa can hurt you:Hyperthermia- A condition when your body is over-heated and cannot shed heat. The high temperatures can pose a risk to children, to those with heart conditions or women who may be pregnant. The high temperatures may also affect fertility in men as well.Electrocution- If a ground fault condition exists and your spa is not properly wired with a GFI protection, electrocution could occur.Drowning- Since the tub is filled with water, the spa poses a drowning risk. Using the tub while under the influence of alcohol or drugs can result in drowning-- Unsupervized children are also at risk.Biohazard- Heated unsanitized water can create health risks- Without santizing your spa its possible to grow bacteria and viruses that can make you sick or kill you.Fall hazard- Some non-textured surfaces make them slippery. With the deeper spas, the higher bar top make them more hazardous to enter and exit.Did I miss anything?