Toenail pain may be related to trauma, onychomycosis, fungal infection and other reasons. 1. Trauma: When the toenail is traumatized, such as being smashed, it can lead to localized bruising at the toenail, which can lead to symptoms of toenail pain. 2. Inguinitis: purulent bacterial infection of the nail groove and its surrounding tissues formed along the sides of the toenail, which can cause redness, swelling, heat and pain. 3. Fungal infection: If the toenail is infected by fungus and gray nails appear, it may be complicated by redness, swelling and pain in the nail groove and other symptoms. It is recommended that people with painful toenails go to regular hospitals in time to clarify the cause of the disease and carry out standardized treatment under the guidance of doctors, so as not to delay the disease and bring adverse effects on the body.