Finger pain can be caused by a variety of factors, including injuries, infections, hypersensitivity, and conditions like arthritis and carpal tunnel syndrome. Sensory nerves in the fingers can become compressed, leading to pinched nerves and pain. Hypersensitivity can also cause people to limit the use of their fingers or hands. Additionally, conditions like allodynia and finger paresthesia can cause extreme pain in response to touch or abnormal sensations. Exposure to caustic agents or extreme temperatures can also cause stinging fingertips. Redness and swelling may be signs of infection or inflammation, and there are various treatments available depending on the underlying cause of the pain.