In occupational hygiene, a physical hazard can be a hazard of one of the following types: Cold Ergonomics (Musculoskeletal disorders, hand activity level, lifting) Heat Ionising Radiation (alpha, beta, gamma, bremmstralung, X-ray) Noise (including Infrasound, Ultrasound) Non-ionising radiation (electric fields, Infrared, Microwave, magnetic fields, Radio Frequency, static electric) Ultraviolet, Visible (including lasers at all operating frequencies) Vibration (Hand-Arm, Whole-body)