Severe nail fungus is mainly caused by the irritation of the soft tissues next to the nail by the local overgrowth of the nail, which requires surgery to ensure that the nail causing the local inflammatory reaction does not grow again for a long time to come. Surgery in patients with severe nail infections should be selective, as the removal of some or even all of the nails does not always achieve the goal of curing the disease. Surgery is usually based on partial nail removal and localized nail bed destruction, which is very important and is the main step to ensure that the root is removed. Patients with severe onychomycosis usually have significant localized soft tissue growths, which also need to be completely removed during the procedure. After surgery, the patient needs to change the medication regularly to ensure that the wound heals and to avoid local infections, and it takes about 1 week for the local wound to recover and heal. You can prevent severe nail infection by adopting good habits, such as avoiding nail trauma and local infection, avoiding wearing tighter shoes, and paying attention to the correct way of trimming nails.