Why do fingernails twist as they grow and cause pain?

Fungus infection: Fungus infection could cause painful disfigured nails. Also a change in bone could press on the nails and cause painful disfigured nails.

Fingernail problem: There are many reasons for the deformation of the fingernails. Among these are some very important systemic diseases. Many facets of fingernail growth are assessed by dermatologist when she or he he looks at them. See a dermatologist now. No excuses.