Arachnodactyly is a condition in which the fingers are long, slender, and curved. They look like the legs of a spider (arachnid).

Commonly Associated With

Spider fingers; Achromachia


Causes may include:

  • Homocystinuria

  • Marfan syndrome

  • Other rare genetic disorders

  • Note: Having long, slender fingers may be normal.

Exams & Tests

The provider will perform a physical exam. You will be asked questions about the medical history.

This includes:

  • When did you first notice the fingers being shaped like this?

  • Is there any family history of early death? Is there any family history of known hereditary disorders?

  • What other symptoms are present? Have you noticed any other unusual things?

  • Diagnostic tests are most often not necessary unless a hereditary disorder is suspected.


Courtesy of MedlinePlus from the National Library of Medicine