Fingernail side seam pain for no reason may be trauma, excessive skin friction, gingivitis and so on. 1. Trauma: If the fingers are pinched, cut the nails when cutting too short to hurt the skin, will cause the fingernails on both sides of the seam pain. 2. Excessive skin friction: If you often do some hand labor, or your hands are often in contact with some irritating substances, it will cause damage to the skin and pain. 3. Inguinitis: If you usually overdo nail trimming or tearing barbs, microorganisms will enter the nail bed through trauma and cause infection, resulting in inguinitis. Fingernails on both sides of the seam pain for no reason, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.