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A physical disorder (as a medical term) is often used as a term in contrast to a mental disorder, in an attempt to differentiate medical disorders that have an available mechanical test (such as chemical tests or brain scans), from those disorders which have no laboratory or imaging test, and are diagnosed only by behavioral syndrome (such as those in the Diagnostic and Statistical Manual of Mental Disorders (DSM).
Differentiating the physical disorders from mental disorders can be a difficult problem in both medicine and law, most notably because it delves into deep issues, and very old and unresolved arguments in philosophy and religion. Many materialists believe that all mental disorders are physical disorders of some kind, even if tests for them have not yet been developed (and it has been the case that some disorders once widely thought to be purely mental, are known to have physical origins, such as schizophrenia).