You can remove a thorn in your foot by yourself or go to the hospital. 1. Self-removal: If the thorn is close to the surface, you can wash your hands and remove the thorn yourself. If the splinter is deeper, you can use tweezers and other tools to disinfect the tweezers with alcohol and then gently pull out the splinter. Pay attention to cleaning the wound and disinfecting it to prevent the area from getting infected. 2. Go to the hospital to remove: If the splinter goes deep into the body and the naked eye can not determine its location, then you need to go to the hospital and cut the skin to remove it. Depending on the condition of the wound, if the wound is deep or contaminated, tetanus antitoxin should be injected to prevent tetanus. If the foot is stabbed deeply by a small thorn, it is recommended to go to the hospital for treatment to prevent the thorn from carrying pathogenic bacteria and causing infection.