Yes, massage guns can be harmful if they are used improperly. Most experts recommend massaging a specific area for no more than two minutes at a time, and it's important to massage soft muscle tissue exclusively. Avoid using a massage gun on bone, tendons, ligaments, and the trunk of your neck (near your carotid arteries). It's also best to avoid using a massage gun on existing wounds and injuries, as the additional blood flow can exacerbate that inflammation rather than alleviate it. Remember: A sore muscle is not the same as a strained, pulled, or torn muscle. Lastly, it's not a good idea to use a massage gun on a place with impaired sensation because you won't be able to tell if you're actually creating further damage to the area.