A high pressure water jet will penetrate the skin, often leaving only a misleading small puncture wound on the skin surface. For example, in hand injuries, initially the person may only feel minor pain, which will gradually increase. Increased swelling and redness also occur in the hands and fingers.

The effect of a high-pressure jet is similar to a gunshot wound: A large amount of energy is transferred to tissues, damaging blood vessels, bones, and other structures. Contaminated water and even air can get into subcutaneous tissues. Even if only a slight damage is visible outwards, internal injuries may be very serious. Subcutaneous pressure can lead to tissue necrosis and amputation.

The general principles for wound care are followed in first aid for pressurised water jet injuries. Work must be stopped immediately and the injured person must be transported to the hospital immediately.

After the situation assessment, the pressure in the damaged area must be reduced (decompression). The dead tissue and any foreign material will be removed. The damaged area is placed in rest (immobilisation). Antibiotic protection is also important.

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