Red, swollen and painful toenails may be caused by trauma, onychomycosis, gout and other reasons. 1. Trauma: If the patient’s toenail is stimulated by trauma, such as collision, bumping, etc., the toenail may be stimulated by the outside world, appearing red, swollen and painful symptoms. 2. Inguinitis: Inguinitis generally refers to improper growth of the toenail embedded in the flesh, leading to bacterial infection, resulting in redness, swelling and pain and other related symptoms, the patient should also go to the hospital in time for drainage if abscesses and other serious symptoms occur. 3. Gout: patients who suffer from gout may also lead to toenail pain, because uric acid crystals may be deposited in the joints, ultimately causing inflammation, toenail redness, swelling, pain and other symptoms, it is recommended that the patient can go to the hospital for uric acid test, to determine whether the gout. Patients should choose comfortable and breathable shoes and socks so as not to cause extrusion of the toenails. Red, swollen and painful toenails are also seen in other causes, it is recommended to seek timely medical treatment, standardized treatment under the guidance of the doctor, so as not to delay the condition.