Magnetic therapy massagers have some potential hazards in some cases. Overuse or improper use can lead to skin irritation, burns or allergic reactions. The magnetic force of a magnetic therapy massager can interfere with the normal function of certain medical devices, such as pacemakers or drug delivery systems. Magnetic therapy massagers are not suitable or safe for certain specific diseases or conditions, such as during pregnancy, for people with epilepsy or bleeding tendencies. Before using a magnetic therapy massager, you should consult your physician for advice and follow the instructions for use and safety precautions.