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


Long, slender fingers can be normal and not associated with any medical problems. In some cases, however, "spider fingers" can be a sign of an underlying disorder.


Causes may include:

Note: Having long, slender fingers may be normal.

When to Contact a Medical Professional

Some children are born with arachnodactyly. It may become more noticeable over time. Talk to your health care provider during a routine exam if your child has long, slender fingers and you are concerned that an underlying condition may exist.

What to Expect at Your Office Visit

The provider will perform a physical exam and ask questions about the person's medical history, including:

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

Review Date: 11/3/2015
Reviewed By: Kimberly G. Lee, MD, MSc, IBCLC, Associate Professor of Pediatrics, Division of Neonatology, Medical University of South Carolina, Charleston, SC. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.

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