What could cause spider veins all over my body?

May be telangiectasi: It may be something else such as telangiectasias or small blood changes. Have then checked by a doctor becuase the can be associated with certain rheumatology conditions.

Genetics, pregnancy.: Spider veins, or more formally known as telangiectasias, are a common part of the aging process, and can appear in multiple areas of the body, but are typically seen in the legs, face, neck and chest. The most common causes include family history or genetics, pregnancy, trauma, hormonal influences, and occupations or activities where one sits ar stands for prolonged periods.