Toenail pain, the cause may be trauma, onychomycosis, fungal infection and so on. 1. Trauma. When the patient’s toenail suffers pressure injury, collision and other traumatic injuries, may make the local capillary damage, toenail pain, may be accompanied by swelling, bruising and other symptoms. 2. Nail groove inflammation. Generally due to the patient’s nails around the soft tissue after the occurrence of tiny puncture wounds, barbs or cut nails too deep and other injuries, resulting in bacterial infection caused by inflammation, so that the toenail pain, in severe cases, the nail will grow into the flesh, resulting in abscesses. Fungal infections can also cause onychomycosis, which requires timely dermatologic consultation. 3. Fungal infection. When fungal infection occurs in the skin around the nails, it may involve the toenails and cause pain, and may be accompanied by redness and swelling. In daily life, patients should avoid toenail injuries, long-term pain, pus or nails into the flesh, should go to the hospital in time for treatment.