Swelling and pain in the fingertips may be caused by nail groin infection, trauma, arthritis and other causes. 1. Nail groin infection: due to pathogenic bacteria infection, such as Staphylococcus aureus, Streptococcus pyogenes, Pseudomonas aeruginosa and so on. Due to the stimulation of inflammation, the fingertip may show symptoms such as swelling, pain and pus. 2. Trauma: accidental squeezing, touching, striking and other causes, resulting in soft tissue injury, fracture and other conditions in the fingertip area, causing swelling and pain in the fingertip. 3. Arthritis: It may be inflammation, infection, trauma or other factors that cause arthritic lesions. When arthritis occurs at the joints of the fingertips, redness, swelling, heat, pain, dysfunction and other symptoms can occur due to local inflammatory lesions. Swelling and pain in the fingertips, should go to the hospital in time, follow the doctor’s instructions for treatment, to avoid delaying the condition.