Plantar warts are common warts that occur on the bottom of the foot. The dangers of plantar warts include the following aspects. First, it is contagious, plantar warts are caused by a viral infection. It can be transmitted to other parts of the surrounding area through small skin breaks. Secondly, it threatens the health of family members, plantar warts can be transmitted through indirect contact, and the papilloma virus can be transmitted to other people through the clothes of family members. Third, plantar warts can cause related symptoms, such as friction and pain when wearing shoes or walking.